Boston Red Sox
Although they have not thrown an MLB pitch in 2024, Wyatt Mills threw 1,053 pitches that were tracked by the PITCHf/x system between 2020 and 2023, including pitches thrown in the MLB Regular Season and Spring Training. In 2023, they relied primarily on their Slider (78mph), Sinker (88mph) and Fourseam Fastball (89mph).
In 2023, compared to other RHP:
Their slider (take this with a grain of salt because they've only thrown 14 of them in 2023) comes in below hitting speed, is basically never swung at and missed compared to other pitchers' sliders, is an extreme flyball pitch compared to other pitchers' sliders, has short glove-side cut and has less than expected depth. Their sinker (take this with a grain of salt because they've only thrown 14 of them in 2023) is so slow that it is substantially gravitational, generates an extremely high number of swings & misses compared to other pitchers' sinkers, results in somewhat more flyballs compared to other pitchers' sinkers and has some natural sinking action. Their fourseam fastball (take this with a grain of salt because they've only thrown 11 of them in 2023) has heavy sinking action, is basically never swung at and missed compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has below average velo and has slight armside run.