Non-MLB
Although they have not thrown an MLB pitch in 2026, J.C. Mejía threw 3,083 pitches that were tracked by the PITCHf/x system between 2019 and 2025, including pitches thrown in the MLB Regular Season, Spring Training and Fall/Winter Ball. In 2025, they relied primarily on their Sinker (95mph) and Slider (86mph), also mixing in a Change (89mph). He also rarely threw a Fourseam Fastball (96mph).
In 2025, compared to other RHP:
Their sinker generates an extremely high number of swings & misses compared to other pitchers' sinkers, has heavy sinking action, has well above average velo and has slight armside run. Their slider has short glove-side cut and has some two-plane movement. Their change is thrown extremely hard, dives down out of the zone, results in more flyballs compared to other pitchers' changeups and has slight armside fade. Their fourseam fastball (take this with a grain of salt because they've only thrown 7 of them in 2025) has heavy sinking action, is basically never swung at and missed compared to other pitchers' fourseamers, has well above average velo and has slight armside run.