Tatsuya Imai Chooses No. 45 as Astros’ New Rotation Anchor
Newly signed Houston Astros pitcher Tatsuya Imai unveiled the personal significance behind wearing No. 45, reflecting his admiration for elite aces while preparing to stabilize Houston’s rotation.
- Glenn Catubig
- 4 min read
The Houston Astros officially introduced Tatsuya Imai to the organization on Monday, marking the start of a new chapter in both his career and the team’s pitching staff. Beyond contract details, Imai revealed the personal significance behind his jersey choice, signaling his intentions as he transitions from Japan’s professional league to Major League Baseball.
Imai, 27, joins a rotation reshaped by offseason turnover and in need of consistent, high-end production. His dominant final season in Japan made him one of the most sought-after international pitchers, and expectations in Houston run high for both performance and leadership.
Choosing a new jersey number represents one of the first visible steps in Imai’s transition to the majors. During his introductory media availability, he explained that No. 45 carries meaning beyond mere preference—it reflects the pitchers who have inspired his approach on the mound.
The Athletic’s Chandler Rome reported Imai’s reasoning on X (formerly Twitter), highlighting that he selected 45 to honor Gerrit Cole and Zack Wheeler, two MLB aces whose careers have shaped his pitching philosophy and goals.
1. Inspiration Behind No. 45
Imai’s decision to wear 45 pays tribute to Cole and Wheeler, who embody traits the right-hander aspires to emulate: durability, command, and power. Both players have established themselves as frontline starters, and Imai hopes to follow a similar trajectory with Houston. The choice also represents a shift from the No. 48 he wore in Japan, signaling a fresh start in a new league and environment. It reflects both respect for his influences and a personal commitment to meeting a high standard in the majors. By linking his number to proven aces, Imai sets a visible benchmark for himself, one that aligns with Houston’s expectations for an immediate contributor in a rotation seeking stability. The number is a subtle yet meaningful statement about his approach to preparation and performance. For fans, the jersey serves as both a connection to MLB stars and a symbolic introduction to Houston’s newest rotation piece. It demonstrates Imai’s awareness of the league’s competitive standards and his readiness to embrace them.
2. Projected Impact in Houston
On the field, Imai brings a combination of strikeout ability and improved control. In 2025, he recorded a 1.92 ERA with 178 strikeouts over 163.2 innings, showcasing a mix of high-velocity stuff and command that made him one of the top international arms available. Houston’s front office structured the signing to provide flexibility, allowing both sides to evaluate fit while maximizing potential upside. The team expects Imai to contribute immediately while acclimating to MLB hitters, ballparks, and schedules. His presence addresses a key rotation need for reliability and leadership. Houston’s offseason turnover left gaps in experience and consistency, and Imai’s combination of talent, preparation, and ambition positions him as a potential stabilizing force. Ultimately, the number on his back symbolizes more than a preference—it reflects the standard he aims to meet and the leadership he hopes to bring as the Astros pursue another competitive season.
3. Symbolism and Transition
Imai’s transition from Japan to Houston extends beyond performance metrics. Wearing No. 45 links past inspiration with present opportunity, establishing a mindset of emulating elite peers while forging his own path. The number serves as a daily reminder of the qualities that define success at the highest level: endurance, command, and the ability to perform under pressure. For Imai, it is a way to channel those traits into tangible contributions for Houston. As the Astros prepare for the season, Imai’s debut will be watched closely by both fans and analysts. His ability to adapt to MLB hitters while living up to the personal standard reflected in his number could define the rotation’s success. In combining symbolism, talent, and opportunity, Imai’s first season in Houston represents both an individual journey and a crucial piece of the Astros’ pursuit of consistency and postseason relevance.