A's rookie pitcher seeking second opinion on forearm tightness

Athletics right-hander Mason Miller is flying to Dallas Monday and will get a second opinion on his forearm tightness on Tuesday, reports Matt Kawahara of the San Francisco Chronicle. Miller was placed on the 15-day injured list with the issue last week.

It’s still unclear what exactly is ailing Miller and what the severity is, though it’s a bit ominous that he’s seeking a second opinion since it would seem to suggest the first opinion had at least some level of concern. The further examination in the coming days will undoubtedly lead to more clarity on the situation and what the next steps are.

The A’s made the aggressive decision to promote Miller, 24, to the big leagues last month despite a very limited professional track record. He was drafted in 2021 and made three Complex League outings late in that year; then a shoulder strain limited him to just six outings across different minor league levels in 2022. He then tossed 16 2/3 innings in the Arizona Fall League but still came into 2023 having tallied less than 40 frames since being drafted.

Nonetheless, his stuff was clearly enticing, including a triple-digit fastball along with a slider and changeup that were also well regarded. Since the A’s were dealing with injuries and underperformance throughout their pitching staff, they decided to give Miller a shot against big league hitters. He’s generally responded well so far, posting a 3.38 ERA through 21 1/3 innings over four starts, striking out 25.9% of opponents against an 8.2% walk rate.

Unfortunately, his acclimation to the majors has been put on hold. It was a week ago that Miller was put under evaluation, with manager Mark Kotsay suggesting that the discomfort seemed to be in his flexor muscle rather than a ligament issue, though the continued testing this week will hopefully help them to zero in on a concrete diagnosis.

Elsewhere on the A’s roster, first baseman/outfielder Seth Brown seems to have suffered a setback in his attempt to return to the club. He’s been on the injured list for over a month due to an oblique strain and began a rehab assignment with Triple-A Las Vegas on the weekend, though Kawahara relays that Brown was removed from his first game of that rehab assignment. He is now heading back to Oakland to have the issue re-evaluated.

Brown, 30, has established himself as a key piece of the Oakland lineup in recent years. He hit 20 home runs in 2021 and added another 25 last year, hitting a combined .224/.294/.457 in those seasons for a wRC+ of 112. He was off to a slow start this year in a tiny sample of eight games before landing on the injured list. It’s unclear if he reaggravated his injury in some kind of serious way, but it’s notable that there’s enough concern for him to leave Vegas for Oakland and further testing.

The two pieces of news are a bit more gloom for a club that is off to a miserable 9-33 start and is actively pursuing a move to Las Vegas. Miller’s ascendency was one of the few positive stories for the A’s so far this year while Brown was one of the only solid everyday players who had yet to be traded away as part of their recent roster teardown. These two updates just add a bit more worry for the clubs and its fans, though more information still needs to come to light in both cases.