Kansas City Royals
Stephen Kolek has thrown 5,790 pitches that have been tracked by the PITCHf/x system between 2023 and 2026, including pitches thrown in the MLB Regular Season, The World Baseball Classic, Spring Training and Fall/Winter Ball. In 2026, they have relied primarily on their Fourseam Fastball (94mph), Slider (83mph) and Sinker (94mph), also mixing in a Change (88mph) and Cutter (90mph).
In 2026, compared to other RHP:
Their fourseam fastball has heavy sinking action and has slightly above average velo. Their slider has exceptional depth and has short glove-side cut. Their sinker has heavy sinking action, is basically never swung at and missed compared to other pitchers' sinkers, has slight armside run and has slightly above average velo. Their change is a real worm killer that generates an extreme number of groundballs compared to other pitchers' changeups, dives down out of the zone, generates fewer whiffs/swing compared to other pitchers' changeups and is much firmer than usual. Their cutter results in many more groundballs compared to other pitchers' cutters, has slightly above average velo and has some natural sink.