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Story summary
- The Houston Astros signed Japanese pitcher Tatsuya Imai to a three-year contract worth $54 million, with incentives potentially rising to $63 million.
- The signing strengthens the Astros' rotation after they lost ace Framber Valdez to free agency.
- Imai is a three-time All-Star in Japan with a 1.92 ERA last season.
- Imai said he is excited to join the Astros and pursue a championship.
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