Guardians option struggling RHP Zach Plesac

The Guardians announced Thursday that they’ve optioned struggling right-hander Zach Plesac to Triple-A Columbus. It’s the first time he’s been optioned to the minors since the 2020 season.

Plesac’s 2023 campaign has been a disaster thus far. While he’s walking fewer hitters than ever (4.8%), he’s also sporting a career-low 13.3% strikeout rate. Opponents have posted a staggering .374/.404/.576 batting line against Plesac, and while a .410 average on balls in play surely points to at least some small-sample randomness that might even out over the course of a season, his struggles can’t be solely pinned on bad luck. 

Plesac has yielded a 91.7 mph average exit velocity, and 43% of the balls put in play against him have been hit at 95 mph or greater. His fastball has averaged a career-low 91.4 mph, and this season’s 9.6% swinging-strike rate is his lowest since debuting back in 2019.

Now 28 years old, Plesac had a strong debut effort in 2019-20, tossing 171 innings of 3.32 ERA ball with a 21.3% strikeout rate and 6.8% walk rate. That performance helped him earn a place in the team’s long-term rotation, but it’s been a steady downhill trajectory since. 

That early success was in no small part due to a tiny .246 average on balls in play and lofty 81.5% strand rate. Those numbers regressed toward the league averages in 2021-22 and did so in conjunction with velocity and strikeout rate both taking a step back. The result was 274 1/3 innings of 4.49 ERA ball — a passable but unexciting set of results that looked more commensurate with a fourth or fifth starter than what Plesac had displayed in his first two seasons.

Now, with Plesac optioned out, the Guards will seemingly go with a mostly young and inexperienced group in the rotation for the foreseeable future. Shane Bieber remains entrenched atop the starting staff, and righty Cal Quantrill is holding onto a spot despite some struggles of his own. Behind that pair, the Guardians currently have a trio of rookies: Tanner Bibee, Logan Allen and Peyton Battenfield. Bibee and Allen are both on Baseball America’s top 100 prospect list and have enjoyed excellent debut efforts. Battenfield impressed with strong Triple-A numbers to earn a look in the big league rotation, and while his results have been mixed, he’ll get a longer look to sort things out.

It’s at least possible that Plesac’s stint in the minors alters his trajectory to free agency, though it would need to be a lengthy stay in Triple-A for that to happen. The right-hander entered the 2023 season with three years, 86 days of major league service time, meaning he needed another 86 days to reach four years of service and remain on track to hit the open market following the 2025 campaign. He’s already picked up 35 of those 86 days, so as long as he returns for at least 51 days, he’ll hit the four-year mark. If Plesac is relegated to Triple-A work for longer than that, it might be a moot point anyhow, as if he can’t pitch his way back into the big league mix he’d become a non-tender candidate this winter.