Tatsuya Imai to Focus on Astros, Not Team Japan’s WBC Quarterfinals

Tatsuya Imai is emerging as one of the most intriguing young pitchers in Major League Baseball, but he won’t be adding to his international résumé just yet. While Team Japan advances to the 2026 World Baseball Classic quarterfinals in Miami, Imai confirmed that he has had no discussions about joining the squad and will stay with the Houston Astros.

The 25-year-old right-hander has impressed in Japan’s professional leagues, posting a 2.04 ERA over 15 starts during the 2022 season. Despite his success, Imai was not part of Team Japan’s championship run in the 2023 WBC, and he will remain on the designated pitcher pool rather than suiting up for the quarterfinals. “I think they’re going to be able to win it no matter what. They don’t need me,” Imai said through an interpreter in an interview with Chandler Rome.

Imai’s decision reflects a focus on his debut MLB season. The Astros are counting on him to slot near the top of their rotation behind ace Hunter Brown, who finished third in the American League Cy Young voting last season. Houston hopes Imai can bring consistency and excitement to a pitching staff that already features multiple high-ceiling arms.

For Astros fans, that means they may have to wait until the start of the MLB season to see Imai in action. While the WBC provides a global stage, his priority is preparing for a full season in Houston, where expectations are high after the club’s recent playoff runs.

1. Imai’s Background and WBC Status

Imai’s rise in Japan has been notable, marked by his height, velocity, and ability to command multiple pitches. Across two professional Japanese leagues in 2022, he demonstrated dominance over lineups, earning attention from MLB scouts and eventually securing a spot with the Houston Astros. Though part of Team Japan’s designated pitcher pool, Imai has yet to receive an official invitation to join the active roster for the WBC quarterfinals. The pool system allows Japan to add pitchers for later rounds if needed, but the team’s depth makes his participation nonessential. His absence will not substantially weaken Team Japan, which remains a favorite heading into the knockout stage. Japan’s pitching depth, combined with a well-rounded lineup, gives them the tools to defend their 2023 championship without relying on newcomers like Imai. By choosing to stay in Houston, Imai ensures he can focus fully on spring training and acclimating to the major league game. The decision underscores his commitment to long-term development rather than short-term international exposure.

2. Role in the Astros Rotation

The Astros envision Imai as a key piece in their starting rotation. Hunter Brown is projected as the staff ace, but Imai is expected to slot right behind him, giving Houston a formidable one-two punch at the top of the rotation. Astros manager Dusty Baker and pitching coach Joe Biagini will likely ease Imai into the MLB schedule, balancing innings limits with opportunities to face high-leverage situations. Early-season performance could determine his role in potential postseason matchups. With Imai on board from the start, the Astros rotation gains a reliable option capable of keeping the team competitive even if other starters encounter injuries or inconsistencies. His command and ability to miss bats make him a strong complement to the veteran-laden staff. Fans can anticipate seeing Imai make his major league debut at Minute Maid Park, where expectations are high for the rookie to provide stability and flashes of dominance reminiscent of his Japanese league days.

3. Implications for Team Japan and MLB

Team Japan’s quarterfinal matchup remains set for Saturday in Miami. While Imai could have been an asset, his decision to stay in Houston does not materially alter Japan’s championship odds. The team still boasts elite pitching and a balanced offense, positioning them as strong favorites to reach the semifinals and potentially defend their 2023 title. The United States, meanwhile, remains on alert after a pool-play miscalculation and an upset loss to Italy left their advancement dependent on other results. Japan’s path appears comparatively straightforward, highlighting the depth and preparation of their squad. For the Astros, Imai’s presence from the start of spring training allows for a controlled ramp-up into MLB competition. Focused preparation over international competition may give him an edge, particularly as the Astros aim to return to the playoffs with a deep pitching staff. Ultimately, Imai’s choice reflects the growing trend of top international prospects prioritizing major league development while still being available for national team play in future WBC tournaments. For now, Houston will be the stage where fans can witness his first major league innings.