Diamondbacks DFA Andrew Knizner, Place Ryne Nelson On 15-Day IL

The Diamondbacks announced this afternoon that they’ve placed right-hander Ryne Nelson on the 15-day IL due to shoulder inflammation, retroactive to September 11. Left-hander Brandon Hughes was selected to the roster from Triple-A Reno to replace Nelson, and catcher Andrew Knizner was designated for assignment to make room for Hughes on the 40-man roster.

Nelson, 26, entered the season seemingly squeezed out of the club’s rotation mix by the club’s signings of lefties Eduardo Rodriguez and Jordan Montgomery over the offseason. That was hardly surprising after a pedestrian 2023 season where he pitched to a below-average 5.31 ERA and 5.07 FIP across 29 appearances (27 starts) for Arizona last year. That said, injuries throughout the club’s rotation have kept Nelson in the club’s rotation almost all year. He’s made the most of the unexpected opportunity and pitched quite well, with a 4.33 ERA that’s roughly league average (96 ERA+) and a strong 3.77 FIP in 147 2/3 innings of work. While that hasn’t necessarily been enough to give him a leg up over fellow youngster Brandon Pfaadt (4.42 ERA, 3.54 FIP) at the back-of-the-rotation, injuries and ineffectiveness have hampered both Rodriguez and especially Montgomery this year, leading the Diamondbacks to kick the latter to the bullpen late last month.

With Nelson now headed to the IL, Montgomery appears ticketed for a return to the rotation as noted by Alex Weiner of AZ Sports. It’s been a disastrous year for the 31-year-old lefty as he pitched to a 6.44 ERA and 4.57 FIP in 19 starts before getting kicked from the rotation, though he’s looked a bit better with a slightly more palatable 4.85 ERA and 4.40 FIP since moving to a multi-inning relief role. For the time being, the Diamondbacks will have to hope that the brief sojourn to the bullpen has helped Montgomery figure things out enough to pitch effectively as a starter for the time being. Fortunately, manager Torey Lovullo told reporters (including Nick Piecoro of The Arizona Republic) that the club is optimistic regarding Nelson’s injury and hopes he’ll be able to return after a minimum stay on the shelf, which could allow him to make one more start before the regular season comes to an end.

Montgomery’s impending move back into the rotation leaves the club down a lefty in the bullpen, and that’s a call that Hughes now figures to answer. Drafted as an outfielder by the Cubs in the 16th round of the 2017 draft, Hughes converted to…