The A’s are plugging right-hander Mitch Spence into their rotation for at least tonight’s start against the Royals, manager Mark Kotsay announced Friday (X link via Martin Gallegos of MLB.com). It’s not clear whether it’ll be a one-off outing or whether Spence, the top pick in December’s Rule 5 Draft, will be guaranteed multiple starts. Still, given the wide slate of injuries on the Oakland staff — Alex Wood, Paul Blackburn and Joe Boyle are all on the 15-day IL, and Ken Waldichuk just had Tommy John surgery this week — it stands to reason that there’s room for Spence to claim a rotation spot if he performs well.
Through the first seven weeks of the season, Spence has made Oakland’s decision to scoop him up with the top pick in the Rule 5 Draft look wise. The former Yankee farmhand has logged 25 1/3 innings of 4.26 ERA ball in a long-relief role, with a significant portion of the damage against him (four runs) coming in one 4 2/3-inning mop-up effort on May 5. Spence coasted through his first four innings that day, yielding only one run and enjoying a trio of perfect frames, before running into trouble trying to get through the fifth inning in what still stands as his longest outing of the season. He tossed 72 pitches that day but hasn’t thrown more than 56 in any other appearance.
Even with that shaky final frame earlier this month, Spence has looked the part of a viable big league arm. It’s a small sample, of course, but he’s fanned a roughly average 22.2% of his opponents against a tidy 7.1% walk rate. Spence’s 54.4% ground-ball rate is more than 10 percentage points higher than the league average. His opponents’ average exit velocity, barrel rate and hard-hit rate are all lower than average as well, and Spence ranks in the 86th percentile of MLB pitchers in terms of generating chases on pitches off the plate.
Given that Spence already tossed 72 pitches in his longest outing of the season and has worked three or more innings on six different occasions, it stands to reason that he should be able to give the A’s at least four innings. If he’s efficient enough, stretching to five frames seems plenty plausible. If the A’s opt to move Spence into the rotation on a more permanent basis, his season-long workload shouldn’t be an issue. The 26-year-old paced all minor leaguers last season with 163 innings over the course of 29 starts. Even if he finishes the season as a starter from here on out, he likely wouldn’t climb to such a lofty innings total.
The A’s are currently leaning on lefty JP Sears and veteran Ross Stripling to anchor the rotation. Young Joey Estes and journeyman Aaron Brooks are also getting starts at the moment. It’s not yet clear when the trio of Wood, Boyle and Blackburn will be back on the active roster, though the latter of the three is expected to be in a walking boot for another couple weeks. (Blackburn is dealing with a stress reaction in his foot.) Oakland recently picked up right Brandon Bielak in a cash deal with the division-rival Astros, giving them another option, but he could also step into Spence’s long-relief/swingman role if the A’s want to see how Spence fares trying to turn over big league lineups multiple times.