The Houston Astros have agreed to a three-year deal with Japanese right-hander Tatsuya Imai, worth $54 million guaranteed and up to $63 million with incentives. The 27-year-old, posted by the Saitama Seibu Lions, brings a strong track record from Nippon Professional Baseball to bolster Houston's rotation. Imai's contract includes opt-outs after each season and performance bonuses based on innings pitched.
Tatsuya Imai, a three-time NPB All-Star, agreed to terms with the Astros on January 1, 2026, one day before his 45-day posting window expired. The deal, reported by multiple sources including MLB.com and CBS Sports, provides Imai with $18 million annually, plus up to $3 million in bonuses for reaching 80, 90, and 100 innings in 2026, potentially increasing his salary to $21 million in 2027 and 2028. He can opt out after the 2026 and 2027 seasons, favoring a shorter-term, higher average annual value over longer offers.
In his standout 2025 season with the Seibu Lions, Imai posted a 10-5 record, 1.92 ERA, and 178 strikeouts over 163 2/3 innings, including a combined no-hitter where he pitched eight innings and a franchise-record 17 strikeouts in a single game. Over eight NPB seasons, he compiled a 58-45 record with a 3.15 ERA and 907 strikeouts in 963 2/3 innings. His arsenal features a four-seam fastball averaging 94.9 mph (reaching upper 90s), a slider with a 46% swing-and-miss rate, a changeup (41% whiff rate), splitter, curveball, and a new Vulcan changeup added in 2025.
The signing addresses Houston's pitching needs after a 2025 season plagued by injuries, including Tommy John surgeries for three pitchers and absences for Spencer Arrighetti and Lance McCullers Jr. Imai joins recent additions Mike Burrows, Nate Pearson, and Ryan Weiss, anchoring behind Hunter Brown in a rotation that may lose Framber Valdez to free agency. Agent Scott Boras compared Imai to Dodgers ace Yoshinobu Yamamoto, stating, "Certainly, he's done everything Yamamoto's done in NPB." Imai himself expressed ambition: "Every season, I have played with the goal of winning the league championship and the Japan Series, and that ambition will not change with a new team."
While the Cubs showed strong interest, teams like the Dodgers, Mets, and Yankees passed due to existing rotations. The Astros will pay a $9.675 million posting fee to the Lions, plus 15% of bonuses. This move positions Imai as a potential No. 2 or 3 starter, with analysts drawing comparisons to Luis Castillo for his pitch profile and Max Scherzer for his approach.