Back problems have limited Merrill Kelly to just two Spring Training outings, and thus it isn’t any surprise that Diamondbacks manager Torey Lovullo announced today that Kelly would start the season on the 15-day injured list. Lovullo told reporters (including Alex Weiner of Arizona Sports) that the club’s starting five will consist of Zac Gallen, Ryne Nelson, Eduardo Rodriguez, Michael Soroka, and Brandon Pfaadt while Kelly recovers.
Kelly’s injury issues surfaced about a month ago, and it was enough to immediately scuttle plans for Kelly to get the Opening Day start. The right-hander received some injections that helped ease the discomfort enough that there was hope that the IL could be avoided altogether, though Kelly didn’t get into any game action until March 13. Over two Cactus League starts, Kelly has been rocked for an 8.31 ERA in 4 1/3 innings, so it’s clear he isn’t quite ready for prime time.
The results themselves aren’t really a red flag, since Kelly is still in the relatively early stages of his ramp-up given how his normal routine was interrupted by his bad back. Assuming he is able to get through extended Spring Training as expected, Kelly may just miss the minimum amount of time on the injured list.
A right shoulder strain 2024 and a nerve impingement in 2020 were both notable injuries for the right-hander, but Kelly has by and large been pretty durable over his seven MLB seasons, including a 184-inning campaign with the D’Backs and Rangers in 2025. After being traded to Texas at the deadline, Kelly returned to Arizona on a two-year, $40MM deal with a vesting option for the 2028 campaign (which would be Kelly’s age-39 season).
Between Kelly’s return and Gallen also somewhat surprising re-signing with Arizona on a one-year deal after his free agent market failed to develop, Soroka is the only new face within a familiar Diamondbacks rotation mix. Corbin Burnes will be back at some point in the second half once he recovers from his Tommy John surgery, so if all goes well, the D’Backs might be dealing with a surplus of arms later in the season if everyone is pitching well. Soroka is the likeliest candidate to move to the bullpen once Kelly is activated from the IL.