11:09pm: Yamamoto told reporters (including Mike DiGiovanna of the Los Angeles Times) that his start was pushed back due to the tightness in his triceps. He felt it again while warming up for his start and mentioned it to Dodgers coaches but didn’t think it was “serious enough” to be scratched from his start. DiGiovanna adds that Yamamoto does not believe the issue to be a serious one, although he’s likely to undergo an MRI tomorrow.
8:57pm: Dodgers right-hander Yoshinobu Yamamoto exited his start against the Royals tonight after just two innings with what the club referred to as triceps tightness. He was replaced by right-hander Michael Grove to start the third inning. As noted by MLB.com’s Juan Toribio, Yamamoto’s velocity was down throughout his abbreviated outing. The righty’s fastball bottomed out at just 92.9 mph, nearly three ticks below his 95.7 mph average to this point in the season.
The shortened start is particularly notable given the fact that the Dodgers pushed Yamamoto’s start back earlier this week. He was initially scheduled to take the ball against the Rangers on Thursday before his start was moved to tonight’s game against Kansas City. Manager Dave Roberts did not indicate at the time of that announcement that the club had any concerns regarding a possible injury for Yamamoto, instead noting that they were building additional rest into his schedule as he makes the transition from pitching once a week in Nippon Professional Baseball to every five days in MLB.
While the severity of Yamamoto’s injury is not yet clear, it would hardly be a surprise to see the Dodgers opt to place Yamamoto on the 15-day injured list following the game. The 25-year-old hurler was the second most coveted free agent of the past offseason behind only teammate Shohei Ohtani thanks to his youth and immense talent. The sweepstakes for his services ended in late December of last year when he inked a 12-year deal with the Dodgers worth $325MM—a record total for any full-time pitcher. Given L.A.’s significant investment in Yamamoto, it would be understandable for the club to act with an abundance of caution and prioritize the right-hander’s long term health.
Fortunately for the Dodgers, replacing Yamamoto in the rotation should be a relatively seamless endeavor for the club if it ends up being necessary. Right-hander Bobby Miller is scheduled to be reinstated from the injured list this coming Wednesday after missing the past two months with shoulder inflammation. Miller, who sports a 3.90 ERA and 3.54 FIP in 25 starts since he made his big league debut last May, could slot into the club’s rotation alongside Tyler Glasnow, James Paxton, Walker Buehler, and Gavin Stone without any significant hiccups.
Even so, the loss of Yamamoto for any amount of time would be a noteworthy blow. After a difficult start to his major league career against the Padres during the Korea Series where he surrendered five runs while recording just three outs, the right-hander has been nothing short of spectacular. In 71 innings of work across his past 12 starts, Yamamoto has posted a 2.41 ERA with an excellent 28.5% strikeout rate and a walk rate of just 5.3%. Yamamoto has paired those strong ratios with a strong 48.7% groundball rate as well. That type of dominant production is difficult to replace, even for a club that has the second best rotation by ERA in the National League behind only the Phillies.
While details regarding Yamamoto’s injury are currently scarce, it’s worth noting that a significant elbow injury could trigger a clause in his contract that alters the dates of his opt-out opportunities. Yamamoto’s contract reportedly includes opt-out opportunities following the 2029 and ’31 seasons, but if he either undergoes Tommy John surgery or spends at least 134 consecutive days on the IL due to an issue with his right elbow prior to that first opt out in 2029, his chances to opt-out would be delayed until after the 2031 and ’33 seasons.