The Astros have designated right-hander Shawn Dubin for assignment, according to Matt Kawahara of the Houston Chronicle. Righty AJ Blubaugh has been called up from Triple-A in the corresponding move (KPRC 2’s Ari Alexander reported earlier today that Blubaugh was on his way to the Astros’ active roster).
Dubin is out of minor league options, so Houston had to go the DFA route in order to remove him from its active roster. Dubin doesn’t have the service time or the past outright necessary to reject an outright assignment to Triple-A, so chances are he’ll just remain in the Astros’ farm system if he clears waivers. A pitching-needy team might consider claiming Dubin off the waiver wire, though is out-of-options status will probably scare off a few clubs, plus his case for sticking on a big league roster isn’t helped by his brutal month of August.
Dubin had a 1.33 ERA over his first 20 1/3 innings of 2025, even if that standout ERA wasn’t quite supported by his secondary metrics. A forearm strain sent him to the 15-day injured list near the end of June, however, and since returning on August 12, Dubin simply hasn’t looked the same. He has been torched for 13 earned runs over five appearances and 5 1/3 innings since being activated from the IL, inflating his ERA up to 5.61 over 25 2/3 total frames.
A bout of shoulder inflammation during Spring Training already put Dubin on the IL to begin the season, and he then didn’t make his 2025 debut until May 11 since an ankle injury set back his recovery. Things seemed fine once he finally got onto the Astros’ mound, yet whether Dubin is just rusty or is still feeling some after-effects from his forearm issue, his recent performance has been too rough for Houston to ignore.
Selected in the 13th round of the 2018 draft, Dubin has spent his entire career in Houston’s organization, debuting in the Show with seven innings during the 2023 season. He then had a 4.17 ERA over 45 1/3 innings in 2024, getting a couple of spot starts but primarily working out of the bullpen. Dubin battled control problems last year but while his walk rate is vastly improved in 2025, his strikeout rate has dropped (from 23.7% to 18.9%).
The Astros’ bullpen has been strong for most of 2025, but the relief corps has hit some major roadblocks beyond just Dubin’s struggles. Star closer Josh Hader will miss at least the rest of the regular season due to a capsule sprain, and southpaw Bennett Sousa (already on the 15-day IL) is now also a question mark, as he’ll be shut down for the next two weeks while dealing with a flexor/pronator strain. Blubaugh is a rookie who has only nine MLB innings on his resume, but he’ll at least be a short-term fresh arm to act as a long man in the pen.