Guardians Promote Tanner Bibee, Designate Konnor Pilkington For Assignment

The Guardians announced Wednesday that they’ve selected the contract of top pitching prospect Tanner Bibee from Triple-A Columbus. He’ll make his Major League debut and start today’s game. In a corresponding roster move, left-hander Konnor Pilkington has been designated for assignment.

Bibee, 24, was Cleveland’s fifth-round pick in 2021 but has quickly outshined that relatively humble draft status. The right-hander breezed through High-A and Double-A in 2022, showing pristine command and a strong ability to miss bats as he pitched to a combined 2.17 ERA in 132 2/3 innings. He’s opened the 2023 campaign with 15 1/3 innings of 1.76 ERA ball and a 19-to-8 K/BB ratio. While Bibee’s command hasn’t been as sharp in this year’s small sample, he’s walked just 6.1% of his opponents since being drafted and boasts a career 32.2% strikeout rate in the minors.

Bibee’s rapid ascension through the Cleveland system is largely attributable to a major jump in fastball velocity. After sitting in the high 80s and low 90s in college at Cal State Fullerton, his heater now resides in the mid-90s. He ranks comfortably within the sport’s top 100 prospects at MLB.com (No. 59), FanGraphs (No. 69) and Baseball America (No. 80). FanGraphs’ Eric Longenhagen details many of the changes Bibee has made to his mechanics, pitch selection and his physique since being drafted — all without sacrificing the command that garnered him attention in the draft.

Cleveland’s rotation has struggled thus far, with Shane Bieber the only member of the Opening Day quintet who’s currently healthy and pitching well. Triston McKenzie is out until at least late next month due to a teres major strain, and Aaron Civale is on the injured list as well thanks to an oblique strain. Cal Quantrill has given up at least three runs in four of his five starts, including a five-run clunker in 3 1/3 innings against the Rockies earlier this week. Zach Plesac has been tagged for a 6.50 ERA through his first four starts. Neither Quantrill nor Plesac have ever missed many bats, but this year’s strikeout rates of 12.8% and 14.9%, respectively, are both career-lows for the pair of righties.

In light of those injuries and shaky performances, Cleveland has begun to tap into its farm system early. Left-hander Logan Allen — not to be confused with the former Cleveland pitcher of the same name — made his big league debut against the Marlins earlier this week and fired six innings of one-run ball. Righty Peyton Battenfield has held his own through three starts in spite of a rocky 10.8% walk rate. Bibee will join the group for now, and with a strong debut, it’s possible he could stake a claim to a rotation spot moving forward.

Given the timing of his call to the big leagues, Bibee won’t have enough days on the schedule to reach a full year of service time in 2023, even if he’s in the big leagues for good. He could still snag that full year of service with a strong showing in the American League’s Rookie of the Year voting, but barring that scenario, he’ll remain under club control through the 2029 season. He will, however, project as an eventual Super Two player if he sticks in the big leagues, which would position him for arbitration eligibility four times rather than three, beginning after the 2025 season.

As for Pilkington, he’s had a tough start to the season in Triple-A. The 25-year-old southpaw has made four starts and been tagged for 13 runs on 19 hits and 11 walks with 14 strikeouts in 14 innings. He had a rough showing in Triple-A last year as well (5.88 ERA in 56 2/3 innings), but Pilkington was also serviceable in 58 Major League frames in 2022.

In last year’s MLB debut, Pilkington worked to a 3.88 ERA over those 58 innings, making 11 starts and another four relief appearances. His pedestrian 19.4% strikeout rate and bloated 12.4% walk rate made that ERA appear rather suspect, but the bottom-line results were solid.

The Guardians will have a week to trade Pilkington or else attempt to pass him through outright waivers. Given that he’s a 25-year-old lefty who’s stretched out to start and has a minor league option remaining beyond this year, there’s a decent chance another club in need of some pitching depth would have interest, if not via a minor trade then at least via waiver claim. If he makes it through waivers unclaimed, he’ll remain in the Cleveland organization, as he doesn’t have the service time or prior outright required to reject an outright assignment to Triple-A.