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Tatsuya Imai Dealing With “Right Arm Fatigue,” Undergoing Examination

By | at April 11, 2026 5:04pm CDT

5:04 pm: The official wording from the team is that Imai is experiencing “right arm fatigue,” according to Rome. He remains on the active roster as of now.

2:47 pm: As the Astros prepare for tonight’s game with the Mariners, Tatsuya Imai has left Seattle to return to Houston to undergo examination from team doctors.  MLB.com’s Brian McTaggart reported earlier today that Imai was heading to Houston, and The Athletic’s Chandler Rome adds the detail that Imai is dealing with a “tired arm,” in the words of a team source.

More will be known once the Astros’ in-house medical staff gets a look at Imai, and it is possible the righty is just dealing with a bit more fatigue than usual.  Some adjustment time was probably inevitable for Imai in his first season in the majors, first and foremost because he is pitching with a bit less rest than usual.  Starters in Nippon Professional Baseball usually start just once per week, as opposed to every-five-days approach of MLB clubs.  Imai hasn’t even been on the five-day schedule yet, as he has had five full rest days between his starts.

That said, Imai’s 7.27 ERA over his first 8 2/3 Major League innings is a sign that something isn’t quite right.  Ironically, his only good start came in the hitter-friendly environment of Sutter Health Park, as Imai tossed 5 2/3 shutout innings against the Athletics on April 4.  That impressive outing was sandwiched between two duds — Imai allowed four runs over just 2 2/3 innings against the Angels on March 29, and last night the Mariners torched Imai for three runs in just a third of an inning.  Imai retired only one of the seven Seattle batters he faced, as he hit a batter, allowed one hit, and issued four walks.

Imai told reporters (via interpreter) postgame that that he was bothered by both the cooler weather in Seattle and a hard mound at T-Mobile Park.  McTaggart notes that Imai had also expressed his issues with getting used to both Major League mounds and the MLB baseball.  Again, an adjustment period isn’t unusual for pitchers coming over from NPB for the first time, though the “tired arm” factor now adds an injury scare to Imai’s status.

Imai signed a three-year, $54MM deal with the Astros last offseason, and he can opt out after each of the first two seasons.  The contract fell below most projections, as it seemed like several teams had concerns over Imai’s ability to translate his NPB success to MLB.  Imai and his agent Scott Boras therefore settled for a shorter-term deal that still locks in some solid immediate money for the right-hander, and allowed him the flexibility to re-enter the market as early as next winter if he pitched well in his first season in the Show.

Losing Imai to the injured list would be another big hit to an already undermanned Houston rotation.  Just within the last week, Hunter Brown and Cristian Javier were both placed on the 15-day IL due to Grade 2 shoulder strains.  The plan for both pitchers is a re-evaluation after two weeks and a general shutdown period of at least three weeks, though the timelines are still fluid.  Even in a best-case scenario, Brown and Javier won’t be back until May, leaving the Astros scrambling for starters even before Imai’s situation arose.

The Astros’ rotation currently consists of Imai, Mike Burrows, and Lance McCullers Jr.  Cody Bolton already made one spot start and might be pressed into more rotation duty.  J.P. France, Ryan Weiss, AJ Blubaugh, and Jason Alexander are other starting candidates either already in the big league bullpen or at Triple-A, and the Astros could use any of this group or more pitchers in a piggyback capacity rather than in a normal starting capacity.  Houston won’t have any time for a rotation reset until an off-day on April 23, as Friday’s game was the first in a stretch of 13 games in 13 days for the club.

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