Diamondbacks option Brandon Pfaadt to Reno to stretch him out as starter

The Diamondbacks did not send Brandon Pfaadt to Reno to disappear him. They sent him there to get him back on a starter’s schedule, and that decision could swing Arizona’s rotation in a matter of weeks.

Pfaadt was optioned to Triple-A Reno on Thursday, June 4, after an inconsistent run out of the bullpen and a season that never settled into one lane. He opened 2026 in Arizona’s rotation, then shifted to relief after three starts when Merrill Kelly came off the injured list and Michael Soroka took a spot in the mix. By the time Arizona made the move, Pfaadt had a 5.92 ERA across 38 innings in 13 appearances, with another report putting his relief ERA at 5.91 over 10 outings. That is not the line of a pitcher the club wants to keep in a pure relief role, especially not one it still views as a rotation answer.

Manager Torey Lovullo said a day earlier that there was a “strong possibility” Pfaadt would be stretched back out as a starter, and that is the real story here. Arizona is trying to buy back the version of Pfaadt that once looked like part of its long-term rotation core, not the stopgap arm who got squeezed by roster math. The Diamondbacks drafted him in the fifth round in 2020 out of Bellarmine University, brought him to the majors in 2023, and watched him throw 96 innings that season. Over the previous two years, he led the club in starts, which is why this is less a demotion than a reset.

The timing matters because Arizona entered play June 4 at 32-29, just half a game from the final National League Wild Card spot. That kind of race makes every inning count, and it also makes every rotation decision feel immediate. To get back to Phoenix, Pfaadt will need to show Reno he can handle a starter’s workload again, not just survive short stints. The club will be watching whether he can stack deeper outings, hold his performance together across multiple turns, and look like a pitcher ready to take the ball every fifth day.

Arizona cleared the roster spot by placing right-hander Taylor Clarke on the bereavement/family medical emergency list and recalling right-handers Kade Strowd and left-hander Philip Abner from Reno. For now, Pfaadt’s assignment is obvious. The stakes are bigger: if he stretches out the way the Diamondbacks want, Phoenix may need him back quickly.