Although they have not thrown an MLB pitch in 2023, Tony Santillan threw 1,171 pitches that were tracked by the PITCHf/x system between 2021 and 2022, all of them occuring in the MLB Regular Season. In 2022, they relied primarily on their Slider (87mph) and Fourseam Fastball (96mph).
In 2022, compared to other RHP:
His slider sweeps across the zone, has exceptional depth and results in more flyballs compared to other pitchers' sliders. His fourseam fastball results in many more groundballs compared to other pitchers' fourseamers, has some natural sinking action, has well above average velo and has slight armside run.