Non-MLB
Although they have not thrown an MLB pitch in 2025, Ian Krol threw 4,312 pitches that were tracked by the PITCHf/x system between 2013 and 2024, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2024, they relied primarily on their Fourseam Fastball (92mph) and Cutter (88mph), also mixing in a Curve (79mph) and Change (85mph).
In 2024, compared to other LHP:
Their fourseam fastball (take this with a grain of salt because they've only thrown 18 of them in 2024) generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers and has essentially average velo. Their cutter (take this with a grain of salt because they've only thrown 15 of them in 2024) results in somewhat more flyballs compared to other pitchers' cutters, has slightly above average velo, has some natural sink and has strong cutting action. Their curve (take this with a grain of salt because they've only thrown 8 of them in 2024) generates an extremely high number of swings & misses compared to other pitchers' curves, is an extreme flyball pitch compared to other pitchers' curves, has a sharp downward bite, is slightly harder than usual and has slight glove-side movement. Their change (take this with a grain of salt because they've only thrown 5 of them in 2024) generates an extremely high number of swings & misses compared to other pitchers' changeups, is an extreme flyball pitch compared to other pitchers' changeups, is much firmer than usual and has some natural sink to it.