New York Mets
Although they have not thrown an MLB pitch in 2024, Sean O'Sullivan threw 5,835 pitches that were tracked by the PITCHf/x system between 2009 and 2016, including pitches thrown in the MLB Regular Season and Spring Training. In 2016, they relied primarily on their Fourseam Fastball (91mph) and Slider (82mph), also mixing in a Sinker (89mph) and Curve (74mph). He also rarely threw a Change (80mph).
In 2016, compared to other RHP:
Their fourseam fastball is basically never swung at and missed compared to other pitchers' fourseamers, has some natural sinking action and has slightly below average velo. Their slider generates fewer whiffs/swing compared to other pitchers' sliders, results in more flyballs compared to other pitchers' sliders, has short glove-side cut, has below average velo and has some two-plane movement. Their sinker has below average velo and has some natural sinking action. Their curve has an exceptional bite, is basically never swung at and missed compared to other pitchers' curves and has below average velo. Their change (take this with a grain of salt because they've only thrown 9 of them in 2016) has below average velo, results in more flyballs compared to other pitchers' changeups and has slight armside fade.