Washington Nationals
Although they have not thrown an MLB pitch in 2024, Sean Doolittle threw 7,553 pitches that were tracked by the PITCHf/x system between 2012 and 2023, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2023, they relied primarily on their Fourseam Fastball (92mph) and Slider (78mph), also mixing in a Splitter (82mph).
In 2023, compared to other LHP:
Their fourseam fastball is straight as an arrow, generates a high number of swings & misses compared to other pitchers' fourseamers, has essentially average velo and results in somewhat more flyballs compared to other pitchers' fourseamers. Their slider (take this with a grain of salt because they've only thrown 17 of them in 2023) comes in below hitting speed, generates an extremely high number of swings & misses compared to other pitchers' sliders, sweeps across the zone, results in more flyballs compared to other pitchers' sliders and has some two-plane movement. Their splitter (take this with a grain of salt because they've only thrown 13 of them in 2023) has surprising cut action, is an extreme flyball pitch compared to other pitchers' splitters, has movement that suggests an extreme amount of backspin, generates fewer whiffs/swing compared to other pitchers' splitters and has below average velo.