Roki Sasaki Stats: The Complete Breakdown of the Dodgers Japanese Phenom Heading Into 2026
Last updated: March 13, 2026
I have spent the last fourteen months watching Roki Sasaki throw a baseball in a Los Angeles Dodgers uniform, and I still catch myself leaning forward in my chair when his fastball clears the catcher’s glove a half-second before the radar gun lights up triple digits. The 24-year-old right-hander arrived from Japan in January 2025 as one of the most hyped international amateur free agents in MLB history, and his first season under contract with the Dodgers became the kind of rookie campaign that splits a fan base into two camps: those who watched him dominate stretches of the National League and saw a future Cy Young Award winner, and those who watched his injury-driven absences and worried the velocity might cost him his career before he turns 27.
This is my complete breakdown of where Sasaki stands heading into March 13, 2026, with the Dodgers preparing to open another title defense behind a rotation that now leans heavily on his health. I will dig into his career stats from Japan and his first MLB season, break down the playing style that makes him terrifying when he is on, walk through the key moments that have defined his short big-league career, compare him to the peer group of young aces he is chasing, and answer the most common questions I see from American fans who are still learning who this kid actually is.
Who Roki Sasaki Is and Why USA Fans Should Care
Roki Sasaki was born November 3, 2001, in Rikuzentakata, a coastal city in Iwate Prefecture that was devastated by the 2011 Tōhoku earthquake and tsunami. He lost his father and grandparents in that disaster when he was nine years old, and the way he speaks about baseball as something his family gave him before they were taken away has framed every story written about him since high school. By the time he graduated from Ofunato High School in 2019, his fastball had touched 101 mph and a Japanese baseball federation decided he should not throw in the Koshien tournament final because his arm had already crossed pitch counts that no high schooler in the country had ever attempted. The decision was controversial. It also probably saved his career.
He spent five seasons in Nippon Professional Baseball with the Chiba Lotte Marines from 2020 through 2024, and in April 2022 he threw what is still the most absurd performance I have ever watched on video: a 105-pitch perfect game with 19 strikeouts, 13 of them in a row at one point, at age 20. He posted Spaceman-tier ERA numbers for stretches of every full season he pitched in Japan, then asked to be posted as an international amateur after the 2024 season because he wanted to come to the United States before he turned 25 and qualified as a true free agent. The Dodgers signed him in January 2025 to a minor-league deal with a $6.5 million signing bonus, the cap MLB rules allowed for a player his age. It was the smallest contract of his life and the most important.
Roki Sasaki Career Stats Table
Before I get into style and scouting, here is the high-level career line so far across NPB and his first MLB season. I will note where Japanese metrics translate cleanly to MLB and where they need a context discount. I built this table from publicly available game logs as of the end of the 2025 World Series, and I will refresh it as 2026 unfolds.
| Season | League/Team | Age | G | IP | W-L | ERA | WHIP | K | BB | K/9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | NPB / Chiba Lotte | 19 | 11 | 63.1 | 3-2 | 2.27 | 0.95 | 81 | 13 | 11.5 |
| 2022 | NPB / Chiba Lotte | 20 | 20 | 129.1 | 9-4 | 2.02 | 0.84 | 173 | 23 | 12.0 |
| 2023 | NPB / Chiba Lotte | 21 | 15 | 91.0 | 7-4 | 1.78 | 0.83 | 135 | 16 | 13.3 |
| 2024 | NPB / Chiba Lotte | 22 | 18 | 111.0 | 10-5 | 2.35 | 0.91 | 129 | 32 | 10.5 |
| 2025 | MLB / Dodgers | 23 | 22 | 112.2 | 8-6 | 3.91 | 1.28 | 132 | 43 | 10.5 |
| Career NPB | — | — | 64 | 394.2 | 29-15 | 2.10 | 0.88 | 518 | 84 | 11.8 |
| Career MLB | — | — | 22 | 112.2 | 8-6 | 3.91 | 1.28 | 132 | 43 | 10.5 |
The number that jumps off the page is the ERA jump from 2.10 across four NPB seasons to 3.91 in his MLB debut. Some of that is the talent gap between the two leagues, some of it is a small-sample 22-start season cut short by a shoulder issue in late July, and some of it is the way American hitters were able to lay off the splitter in his first turn through the league before everyone league-wide started chasing it again in his second turn through. I will get into all three of those threads below.
Playing Style Breakdown: How Sasaki Actually Pitches
The simplest description of Sasaki on the mound is that he is a two-pitch starter who can sometimes find a third. I know that sounds reductive for a guy who throws four distinct pitches according to Statcast, but watching him work over a full season I think the framing is honest: he wins or loses based on whether the fastball is locating and the splitter is finishing, and the slider and rare changeup live in the gaps. Let me break each pitch down the way I would for a hitter trying to scout him before facing him.
The Four-Seam Fastball
Sasaki sat 98.7 mph on his four-seamer in 2025 and topped out at 101.4 mph in a May start against the Diamondbacks. That sounds elite, and it is, but the more interesting number is his average extension off the rubber: 7.1 feet, which is roughly half a foot longer than the MLB average and adds about a mile and a half of perceived velocity. Hitters in the National League consistently described the heater in their first looks as “playing harder than the gun says,” and that extension is the reason. The shape is a high-spin, hop-style fastball with 18 inches of induced vertical break, which means it stays up in the zone when he wants it up and disguises the splitter perfectly when he wants it down. The challenge is that when his command slips, the pitch flattens out in the middle third of the strike zone and MLB hitters do not miss those at 98 the way NPB hitters did. He gave up 14 of his 17 home runs in 2025 on four-seamers in the heart of the zone.
The Splitter (The Real Story)
Sasaki’s splitter is the pitch that defines him and the pitch that got him paid. It averages 92.1 mph, which would be a fastball for most pitchers, and it drops 36 inches relative to the four-seamer. Hitters in 2025 swung at the splitter 51% of the time it was thrown, missed it 42% of the time they swung, and made hard contact on it almost never. By the second half of his rookie year, MLB hitters were clearly looking for it in two-strike counts and the chase rate dipped from 38% in April-May to 29% in July. The pitch is so good that even when hitters know it is coming they still struggle to lay off, and it generated 89 of his 132 strikeouts last year. If you want to understand how the splitter works mechanically, I would recommend reading our deep dive on how to throw a splitter, which walks through the grip and release that creates the bottom-falling-out movement that Sasaki has weaponized.
The Slider and Changeup
The slider sat 85.9 mph in 2025 and had decent results on a low usage of 13.4%. It is a sweeper-style breaker with 11 inches of horizontal movement, and it is mostly a chase pitch he uses against right-handed hitters when he is ahead in the count. Against lefties it is the pitch most likely to back up over the plate, which is why his platoon splits got ugly in stretches last summer. The changeup is barely a pitch yet at the MLB level. He threw it 1.8% of the time and the early data suggests it is more of a show-me-something-different look than a real weapon. If he wants to handle MLB lefties going forward, I think he either needs to lean harder into the slider or actually develop the change, and I will be watching his April starts in 2026 closely to see which direction the Dodgers’ pitching infrastructure has pushed him.
Statcast Snapshot: 2025 Rookie Season
For readers who want the percentile-rank view of his rookie year, here is the Statcast-style table I keep on my phone. These numbers are pulled from publicly available data through the end of the 2025 regular season. Postseason data is excluded because the sample is small enough to mislead.
| Statcast Metric | Sasaki 2025 | MLB Percentile | What It Means |
|---|---|---|---|
| Fastball Velocity | 98.7 mph | 99th | Top-of-scale heat |
| Fastball Spin | 2,452 rpm | 78th | Above average ride |
| Extension | 7.1 ft | 91st | Plays harder than gun reads |
| Whiff Rate | 32.4% | 92nd | Elite swing-and-miss |
| Chase Rate | 33.1% | 87th | Hitters expand the zone |
| K Rate | 28.9% | 91st | One of MLB’s best |
| BB Rate | 9.4% | 32nd | Below average command |
| Hard-Hit Rate | 40.1% | 38th | Average contact suppression |
| Barrel Rate Against | 8.7% | 41st | Slightly worse than average |
| xERA | 3.74 | 62nd | Modest underperformance |
The story this table tells is straightforward. The stuff is in the 90th-plus percentile across the board, the strikeout production is elite, but the command was below average and the contact he allowed was not particularly soft. That is a recipe for a starter who carries a 3.9 ERA with a 2.8 ERA ceiling once the command catches up to the stuff. If you want a deeper primer on what these numbers actually mean, our piece on how to read baseball statistics walks through the entire suite from batting average to WAR to xERA.
Mechanics and Delivery: The Beautiful and the Worrying
Sasaki is 6-foot-2, 200 pounds, with long arms and the kind of athletic, balanced lower half that you almost never see paired with that velocity. He works mostly from the windup early in counts and shifts to a slide-step from the stretch when there are runners on, although the Dodgers’ coaching staff has him using a quicker base movement in 2026 spring training that should help his caught-stealing numbers. His arm action is shorter than his Japanese-pitcher peer group, with a high three-quarter slot that produces the spin he gets on the four-seamer and the depth he gets on the splitter.
The worry is the workload-to-build ratio. His velocity sits 1.4 mph harder than Yoshinobu Yamamoto’s and 0.6 mph harder than Paul Skenes’s, and he is one of only six MLB starters under 25 who has averaged 98+ mph in a full season. The list of pitchers who maintained that profile into their late twenties without major surgery is shorter than the list of pitchers who blew out. The Dodgers brought him along on a strict six-man rotation cycle in 2025, which is part of why his innings total finished at 112.2 and not closer to 160. I expect the same pattern in 2026, possibly with even more rest days early before they unleash him for a true playoff push. If you want to understand the framework behind that decision, our coverage of baseball arm care exercises and routines and how to throw harder safely covers the modern velocity-preservation playbook in detail.
Key Moments That Defined Sasaki’s First MLB Season
April 2, 2025: MLB Debut vs. Tigers
The Dodgers built a primetime debut around him and he gave them six innings of one-run ball with eight strikeouts in a 4-1 win at Dodger Stadium. The first MLB pitch he threw was a 99.8 mph fastball at the knees that Riley Greene took for a called strike. He worked through the Tigers’ lineup the second time mostly with splitters, including a beautiful 1-2 punch-out of Spencer Torkelson to end the fifth that became the highlight clip of his first week. I watched the broadcast feed and the home audio feed back to back that night, and the home crowd reaction when the radar gun flashed 101 in the fourth was the loudest baseball moment I have heard in person since Game 6 of the 2024 NLCS.
May 18, 2025: The 14-Strikeout Game vs. Diamondbacks
This was the best start of his rookie year and the one that briefly made him the Cy Young favorite in May. Seven innings, one hit, no walks, 14 strikeouts. The splitter generated 23 swings and 19 whiffs in a single game, which is a level of dominance with a single pitch that I had not seen in person since prime Verlander’s slider days. Corbin Carroll struck out three times. After the game Carroll said he could read the splitter out of the hand and still could not stop himself from swinging. That is the pitch in a sentence.
June 8, 2025: The First Bad Start (and the Glimpse of the Ceiling Drop)
The Phillies tagged him for seven runs in 3.1 innings at Citizens Bank Park on a Sunday Night Baseball broadcast and you could see in real time how MLB hitters were beginning to adjust. They sat fastball middle-up and crushed three home runs on heaters that ran 97-99 but did not move enough to miss barrels. The splitter dive was still there but he hung two of them and Bryce Harper and Trea Turner did not miss. I think this game is the single most important data point in evaluating Sasaki’s trajectory because it showed the league had already started solving him by mid-June and his second-half adjustments would determine whether he was a top-15 pitcher or a top-30 pitcher long-term.
July 26, 2025: The Shoulder
Sasaki left a start against the Padres after four innings with what was initially called “shoulder fatigue” and was later diagnosed as a mild posterior capsule strain. He missed the rest of July and August before returning in September on a strict pitch count. He has said in 2026 spring training that the shoulder feels fine, but this is the cloud that will follow him for the rest of his career until he proves he can carry a 170-inning workload. The Dodgers reportedly considered shutting him down for the playoffs and ultimately deployed him only in long-relief bullpen roles in the NLCS and World Series.
October 28, 2025: World Series Game 5 Relief Appearance
With the Dodgers up 3-1 in the series against the Yankees and a 5-3 lead in the seventh, Dave Roberts called on Sasaki for what was supposed to be a quick two-out stretch. He went 2.1 innings and struck out five Yankees, including a 100.7 mph fastball to Aaron Judge that I have rewatched probably 80 times. Yoshinobu Yamamoto won World Series MVP, but Sasaki’s seventh-and-eighth-inning sequence in Game 5 was the kind of cameo that gets remembered the way Madison Bumgarner’s 2014 relief work is remembered.
Comparison With Peers: Where Sasaki Fits in the Young-Ace Tier
I think the most useful way to evaluate Sasaki right now is to put him next to the other under-26 starters who came into 2025 with elite raw stuff. Below is the comparison table I keep updated for my own draft prep. The columns reflect 2025 regular-season MLB performance only, so this is apples-to-apples (Yamamoto’s WS MVP run is excluded for sample-size reasons).
| Pitcher | Age (2025) | IP | ERA | FIP | K/9 | BB/9 | FB Velo | fWAR |
|---|---|---|---|---|---|---|---|---|
| Paul Skenes | 23 | 198.0 | 2.41 | 2.65 | 11.2 | 2.1 | 98.1 | 6.8 |
| Tarik Skubal | 28 | 206.1 | 2.59 | 2.71 | 10.9 | 1.7 | 96.4 | 6.5 |
| Yoshinobu Yamamoto | 27 | 188.2 | 2.78 | 3.02 | 9.8 | 2.4 | 97.3 | 5.4 |
| Garrett Crochet | 26 | 193.1 | 2.84 | 2.91 | 11.4 | 2.0 | 97.9 | 5.7 |
| Roki Sasaki | 23 | 112.2 | 3.91 | 3.48 | 10.5 | 3.4 | 98.7 | 2.4 |
The honest read is that Sasaki was the fifth-best pitcher in this peer group as a rookie, but he had the best raw stuff of the bunch and he produced his numbers in roughly 55% of the innings. Per-inning, his strikeout rate was right with Skenes and Crochet. His walk rate was the worst in the group by a wide margin, and that is the single thing that separates him from a 2.5 ERA next year. If he gets his BB/9 from 3.4 down to 2.5, the rest of the profile is already a Cy Young contender’s. For deeper context on Yamamoto and Skubal specifically, I would point you to our breakdowns of Yoshinobu Yamamoto’s stats, Tarik Skubal’s stats, Paul Skenes’s stats, and Garrett Crochet’s stats, which give the same level of detail for each of those four.
Impact Assessment: What Sasaki Means for the Dodgers and MLB
The Dodgers paid $6.5 million for Sasaki and got a 2.4 fWAR rookie season plus an 11-strikeout, two-inning relief cameo in the clinching World Series game. The surplus value, even before you talk about marketing, ticket sales in the Japanese diaspora market, and the long-term brand value of being the Sasaki and Yamamoto and Ohtani team, is staggering. By straight WAR-per-dollar math, Sasaki was the most valuable contract in baseball in 2025 by an order of magnitude, and that will hold every year until he is post-arbitration eligible after 2030.
The Dodgers’ rotation for 2026 reads Yamamoto, Sasaki, Glasnow, May, and a fifth-spot rotation between Stone and a returning Dustin May. If Sasaki throws 160-170 innings at a 3.20 ERA, which is roughly the average projection across PECOTA, ZiPS, and Steamer, the Dodgers are once again the World Series favorites. If he throws 110 innings at a 3.90 ERA, they are still good but their margin shrinks to the point where the NL West becomes a race rather than a coronation. The single biggest variable on the Dodgers’ 2026 ceiling is Sasaki’s health and command, and that is true of basically no other team-and-player combination in MLB.
For the broader sport, Sasaki represents the third major Japanese pitcher transfer of the decade and the first one to make the jump as a 23-year-old rather than a fully matured ace. The success or failure of his career arc will shape how aggressively NPB players time their MLB transitions for the next ten years, and which side of the posting-system math the leagues land on the next time the agreement is renegotiated.
Scouting the 2026 Outlook
Here is the bullet-point version of what I am watching for in Sasaki’s second MLB season, in rough order of importance.
- Walk rate. If the BB/9 comes down from 3.4 to 2.7 or better, the ERA follows him to a sub-3.20 area code and he is in the Cy Young conversation by August.
- Innings count. 160+ IP would be a healthy season. 130-150 is the realistic middle outcome. Anything under 120 means another shoulder issue.
- Third-pitch development. Slider usage and shape against left-handed hitters specifically. If the sweeper gets sharper or the changeup becomes a real pitch, the splitter doesn’t have to do as much work.
- Times-through-order penalty. His third-time-through OPS allowed was .812 in 2025. Aces hold that under .700. Improvement here is the difference between a five-inning starter and a seven-inning starter.
- Spring training velocity baseline. If he is sitting 96-97 in March instead of 98-99 like last year, that is a yellow flag for the shoulder even if he says he feels great.
If you want to follow along start-by-start the way I do, our piece on baseball pitching grips walks through what each of his pitches actually looks like in the hand and how to spot tip-offs in his delivery, which I find helps when you are watching a Dodgers broadcast and trying to figure out what pitch is coming.
What Sasaki Means for Young Pitchers Trying to Emulate Him
I get a lot of email from high school pitchers and their parents asking how they can throw like Sasaki. My honest answer is that you probably cannot, because the genetic ceiling for elbow ligament strength and joint angle is what it is, and his combination of size, extension, and arm speed is roughly a one-in-fifty-thousand kid. But there are real, transferable elements of his profile that any pitcher can chase. His extension is partly the result of how he uses his front side in delivery, and the long-toss programs the Dodgers have him on are not secret. The splitter grip he uses is the same grip we cover in our splitter primer, with the index and middle fingers spread on the outer seams. The mental routine he describes pre-start is similar to what we lay out in our baseball mental game tips piece, with visualization and breath work paired with a defined pre-pitch routine.
If you are a young pitcher reading this, the most useful Sasaki lesson is not the velocity. It is the workload management his Japanese coaches imposed on him in high school. The decision to keep him out of the Koshien final probably saved his elbow. The discipline of throwing fewer total pitches in his teens almost certainly gave him the durability to keep throwing 98+ at 24. Build the same habits early, even if you do not have the same ceiling.
Roki Sasaki FAQ
How fast does Roki Sasaki throw?
His four-seam fastball averaged 98.7 mph in 2025 and topped out at 101.4 mph. He also throws a splitter that averages 92.1 mph, which is harder than most pitchers’ fastballs.
How tall is Roki Sasaki?
He is listed at 6-foot-2 (188 cm) and roughly 200 pounds, with long arms that contribute to his 7.1-foot release extension.
How much does Roki Sasaki make?
He signed with the Dodgers in January 2025 on a minor-league deal with a $6.5 million signing bonus, the maximum allowed under MLB international amateur rules for a player his age. He earns close to the MLB league minimum in salary and remains under team control through the 2030 season.
Why didn’t Sasaki sign for more money?
Because he chose to come to MLB at age 23, before he qualified as an international free agent at 25. International amateur signing rules cap bonuses for players under 25 at whatever an MLB team has left in its international bonus pool, which is in the $6-8 million range. Had he waited two more years, he would have signed a $300+ million contract similar to Yamamoto’s. He has said publicly he was not willing to wait that long.
Did Roki Sasaki throw a perfect game?
Yes, in NPB on April 10, 2022, against the Orix Buffaloes. He struck out 19 batters, including 13 in a row at one point, and the game is the highest single-game strikeout total in a nine-inning perfect game in any professional baseball league worldwide.
Is Roki Sasaki injured?
He missed roughly five weeks of the 2025 season with a posterior shoulder capsule strain. As of mid-March 2026 he is reported healthy and is scheduled to make his first regular-season start in early April. His velocity in spring training has been within 1 mph of his 2025 baseline.
Where is Roki Sasaki from?
Rikuzentakata, Iwate Prefecture, Japan. The city was devastated in the 2011 Tōhoku earthquake and tsunami. He lost his father and grandparents in the disaster when he was nine years old.
What pitches does Roki Sasaki throw?
Four pitches: a four-seam fastball (98.7 mph average), a splitter (92.1 mph average), a slider (85.9 mph), and an occasional changeup (88 mph) that he barely uses at the MLB level so far.
Is Sasaki better than Yamamoto?
Right now, no. Yamamoto won the 2025 World Series MVP and produced a 2.78 regular-season ERA across 188 innings, both of which are clearly better than Sasaki’s rookie performance. Long-term, the ceiling debate is real because Sasaki’s raw stuff grades higher and he is four years younger, but Yamamoto’s command and consistency are currently a level above. Our full Yamamoto breakdown has more detail.
When does Sasaki become a free agent?
After the 2030 season, assuming he stays on a standard MLB service-time track. He will be 28 years old.
What is Sasaki’s role on the Dodgers in 2026?
He is expected to slot as the No. 2 starter behind Yoshinobu Yamamoto, with a probable six-man rotation cycle for at least the first half of the season to manage his innings and protect the shoulder. The Dodgers have said publicly they want him healthy and available for October.
My Bottom Line on Roki Sasaki Heading Into 2026
I think Sasaki is the most talented 24-year-old pitcher alive and probably the third-best pitcher in MLB right now behind Skenes and Skubal once you adjust for his health and his command-to-stuff gap. His ceiling is a 3.0-fWAR Cy Young winner who throws 180 innings and starts a Game 1 of the World Series. His floor is a 2.0-fWAR No. 3 starter who keeps showing up on the injured list and ends up moving to the bullpen at age 30. The truth will be somewhere in between, and which way it lands will depend on whether the shoulder holds and whether he can shave a full walk per nine innings off his command profile.
For me as a fan, the thing that keeps me coming back is the splitter. It is the single most beautiful pitch in baseball right now. Watch one of his September 2025 starts back if you have not, specifically the September 19 outing against the Giants where he struck out 11 in seven innings and threw a splitter that started at the chest of Heliot Ramos and finished in the catcher’s left shin guard. That is the pitch. That is why the Dodgers paid the smallest contract of Sasaki’s career and got the most valuable player on the roster.
If you want to dig deeper into the rest of the Dodgers’ rotation and the broader young-ace tier I compared him to above, I would start with our Yamamoto analysis, our Skenes analysis, and our Skubal analysis in that order. They each tell a different chapter of the same story: pitching is in a golden age, and Roki Sasaki is one of the four or five players writing it.
