Boston Red Sox
Although they have not thrown an MLB pitch in 2023, Garrett Whitlock threw 2,487 pitches that were tracked by the PITCHf/x system between 2021 and 2022, including pitches thrown in the MLB Regular Season and Spring Training. In 2022, they relied primarily on their Sinker (95mph), also mixing in a Change (85mph) and Slider (83mph). He also rarely threw a Fourseam Fastball (96mph).
In 2022, compared to other RHP:
His sinker generates an extremely high number of swings & misses compared to other pitchers' sinkers, is blazing fast and results in somewhat more flyballs compared to other pitchers' sinkers. His change has an obvious armside fade, results in somewhat more flyballs compared to other pitchers' changeups and has some natural sink to it. His slider has exceptional depth, generates more whiffs/swing compared to other pitchers' sliders and has primarily 12-6 movement. His fourseam fastball (take this with a grain of salt because he's only thrown 5 of them in 2022) is basically never swung at and missed compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has well above average velo and has slight armside run.