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BigPaulSports > Blog > Game Analysis > Who is Rōki Sasaki? What to know about the Japanese pitching sensation bound for MLB
Game Analysis

Who is Rōki Sasaki? What to know about the Japanese pitching sensation bound for MLB

BigP
Last updated: 2025/01/17 at 11:41 PM
BigP Published January 17, 2025
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Who is Rōki Sasaki? What to know about the Japanese pitching sensation bound for MLB
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Rowan Kavner

Rowan Kavner

MLB Writer

Editor’s Note: The story below originally ran in November, after Roki Sasaki’s NPB team pledged to post the Japanese star pitcher. Sasaki announced Friday he was signing with the Los Angeles Dodgers.

The latest pitching sensation out of Japan is bound for Major League Baseball in 2025. 

The Chiba Lotte Marines announced that they have decided to begin the process of posting star pitcher Roki Sasaki, clearing the path for the hard-throwing 23-year-old to transfer from Nippon Professional Baseball to MLB. Sasaki will be subject to international amateur free-agent restrictions, making him available for all 30 teams to sign at a much more modest cost than he would go for on the open market. 

Players who are posted under the age of 25 can only sign a minor-league deal from an MLB club’s international bonus pool money. Think more Shohei Ohtani, who was under the same limitations when he signed with the Angels for a paltry $2.3 million in December 2017, than Yoshinobu Yamamoto, who was 25 when he signed with the Dodgers for a record $325 million last offseason. 

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While Yamamoto was the more decorated and durable pitcher in NPB, Sasaki is younger, bigger and throws harder. The flamethrower has been on the international radar dating back to his high school days and gained further acclaim in April 2022, when he threw a 19-strikeout perfect game for the Marines at just 20 years old. 

RELATED: 2025 MLB free-agent rankings, team fits: Where does Roki Sasaki slot in?

Sasaki can light up a radar gun. His fastball has clocked in over 102 mph in Japan and touched 101.9 at the World Baseball Classic, where he sat 100.5 mph and got a bevy of whiffs with his devastating splitter. He was teammates with Yamamoto and Ohtani when Samurai Japan won that 2023 tournament, and there is heavy speculation that he’ll team up with them again next year in Los Angeles. The Dodgers are among the clubs who have expressed interest in Sasaki for years. 

But unlike the pursuit for Yamamoto, every team will be in the mix to acquire Sasaki, given the restrictions capping his earnings. 

Orix received more than $50 million from Yamamoto’s posting fee last year. Chiba Lotte would likely have seen a similar return had the Marines waited another two years until Sasaki was 25. NPB teams control their players’ rights for nine seasons, after which they become free agents and are no longer subject to posting fees. 

But Sasaki has long expressed his desire to pitch in the majors, and while that request wasn’t granted last year, his Japanese club now appears willing to satisfy its young star’s wishes, as it stated Saturday in a statement on X. 

After throwing his perfect game two years ago, Sasaki followed that pristine performance with eight perfect innings. He finished 2022 with 173 strikeouts in 129.1 innings, then registered an even higher strikeout rate a year later, fanning 135 batters in 91 innings. 

Over his four years in NPB, Sasaki tallied a 5.74 strikeout-to-walk ratio — more than a full strikeout higher than Yamamoto, whose 4.48 mark was still good enough to make him the highest-paid pitcher in MLB history. That stat demonstrates Sasaki’s ceiling. His durability presents the red flag. 

Rōki Sasaki’s best pitches in the World Baseball Classic

Rōki Sasaki's best pitches in the World Baseball Classic

While Yamamoto routinely crossed the 170-inning mark in Japan, Sasaki has never thrown even 130 innings in a season. Arm issues this year limited him to 111 innings and likely contributed to slightly diminished velocity and overall stuff. He was still plenty productive, but his 2.35 ERA, 1.04 WHIP and 4.03 K/BB all represented dips from the dazzling 1.78 ERA, 0.75 WHIP and 7.94 K/BB he posted the season prior. 

Still, he is one of the most intriguing arms available this winter. All 30 clubs will have 45 days to negotiate with Sasaki after he is posted. Once he signs, he is subject to the same rules and team control as any other rookie player. 

It is not yet clear if Sasaki will be posted before the 2024 signing period ends on Dec. 15 or when the 2025 signing period begins on Jan. 15. Whenever he does, he will slot in alongside Corbin Burnes, Blake Snell and Max Fried as one of the most desired pitchers on the market. 

And unlike those other aces, he won’t break the bank. 

Rowan Kavner is an MLB writer for FOX Sports. He previously covered the L.A. Dodgers, LA Clippers and Dallas Cowboys. An LSU grad, Rowan was born in California, grew up in Texas, then moved back to the West Coast in 2014. Follow him on Twitter at @RowanKavner.

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BigP January 17, 2025
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