It’s a disappointing development, albeit potentially short-term for the young Pirates right-hander. Keller is still only 25, but struggled on the hill in 2021. In 12 starts, Keller has been scored for a 7.04 ERA in 47 1/3 innings. An FIP of 4.95 and a BABIP of .355 indicate some bad luck for Keller this season. He has a 22.4% strikeout rate and a 12.7% walk rate, and while both numbers are below average, they represent an improvement over his 2020 production.
According to Jason Mackey of the Pittsburgh Post-Gazette, manager Derek Shelton said: “Mitch Keller is going to be a good major league pitcher. When young players, young pitchers are struggling, it’s our job to come up with a program and a plan to help them get back to that level and be successful at that level. This is what we do with Mitch.
Cahill also had some bad luck as the veteran posted a 6.57 ERA, but just 4.04 FIP in 37 innings. Short term, Wil Crowe will take Cahill’s place in the rotation. The former Nationals farm worker has eight appearances this season (seven starts) with a 7.26 / 6.12 FIP ERA in 31 innings.
Geoff Hartlieb was also recalled, notes John Dreker of Piratesbaseball.com. The 27-year-old has only made one appearance this season, despite registering a 3.63 ERA in 22 1/3 innings of work last season.