The Diamondbacks have reinstated veteran starter Merrill Kelly from the 60-day injured list, the team announced. To make room for the right-hander on the active roster, righty reliever Scott McGough has been optioned to Triple-A Reno. Meanwhile, fellow righty Humberto Castellanos has been designated for assignment to free up a spot on the 40-man.
Kelly, now 35, was a durable and dependable starter for the Diamondbacks from 2021-23, making 90 starts and pitching to a 3.66 ERA and 4.16 SIERA. He got off to a strong start over his first four outings in 2024, putting up a 2.19 ERA and 3.88 SIERA in 24 2/3 innings pitched, but he suffered a teres major strain in mid-April. The right-hander will make his highly anticipated return this afternoon against the Phillies, and the D-backs will have their full rotation healthy for the first time this season. Manager Torey Lovullo now has six healthy starters at his disposal: Zac Gallen, Brandon Pfaadt, Eduardo Rodriguez, Jordan Montgomery, Ryne Nelson, and Kelly.
McGough, 34, signed a two-year deal with Arizona during the 2022-23 offseason. He was a serviceable middle reliever last season, pitching to a 4.73 ERA and 3.49 SIERA over 70 1/3 innings, but he has struggled in 2024. Over 29 innings, McGough has a 6.83 ERA and 5.63 SIERA. This is the third time he has been optioned this season.
As for Castellanos, 26, he has failed to make much of an impression over 32 games (16 starts) for the Diamondbacks at the big league level. Since the D-backs claimed him off of waivers from the Astros during the 2020-21 offseason, he has pitched to a 5.29 ERA and 4.89 SIERA over 100 1/3 innings as both a starter and a reliever. His minor league stats aren’t much better; he has a 4.59 ERA and 6.64 FIP at Triple-A this year. If Castellanos passes through waivers unclaimed, he will have the right to reject an outright assignment to Triple-A and elect free agency.