UPDATE: The Houston Astros have just announced a blockbuster deal with star Japanese right-hander Tatsuya Imai. This groundbreaking agreement guarantees $54 million over three years, potentially reaching $63 million with incentives, making it the second-largest contract ever for a Japanese pitcher based on average annual value.
Sources confirmed to ESPN’s Jeff Passan that this deal positions Imai just behind Yoshinobu Yamamoto’s monumental 12-year, $325 million contract with the Los Angeles Dodgers signed in December 2023. The terms of Imai’s contract, first reported by MLB Network, include opt-outs, allowing for flexibility in his future.
At just 27 years old, Imai entered the MLB posting system as one of the most sought-after free agents this winter. His impressive performance in the 2025 season with the Seibu Lions of Japan’s Nippon Professional Baseball (NPB) included a 10-5 record and an outstanding 1.92 ERA with 178 strikeouts in 163.2 innings.
Agent Scott Boras has drawn comparisons between Imai and Yamamoto, stating, “Certainly, he’s done everything Yamamoto’s done.” This endorsement highlights the rising star’s potential impact in Major League Baseball.
Imai’s command has significantly improved over the years, with his walks per nine innings dropping from 5.1 in 2022 to 2.5 in 2025. He has consistently delivered exceptional results, maintaining an ERA under 3.00 for the past four seasons, showcasing his prowess with a fastball that regularly sits between 93 and 97 mph and has even reached 99 mph.
His 2025 highlights include an incredible eight-inning performance in a combined no-hitter against Fukuoka on April 18 and a record-setting 17 strikeouts against Yokohama on June 17, surpassing the previous team record held by Daisuke Matsuzaka since 2004.
Imai’s pitching style is distinctive, featuring a slider that exhibits arm-side movement and a splitter that he uses effectively. His unique attributes and strong track record in NPB have drawn attention, making him a valuable asset for the Astros as they aim for continued success.
With Imai now officially part of the team, the Astros will not need to give up draft compensation, a significant advantage compared to free agents like Framber Valdez, Ranger Suarez, and Zac Gallen who would require such compensation.
As the MLB offseason progresses, all eyes will be on Imai’s transition to Major League Baseball and how he will perform in the highly competitive environment. Fans and analysts alike are eager to see how this contract will influence the Astros’ strategy moving forward.
Stay tuned for more updates on Imai and the ongoing developments in MLB free agency.