Complementing his fastball, Sproat throws a slider, changeup, and curveball. Over the winter of 2023, the Mets worked with the right-hander to add a sweeping slider to his repertoire in addition to his almost cutter-like gyro slider, and not only did he take to the additional pitch quickly, but it improved his overall repertoire as a whole; his above-average fastball became an almost certainly plus pitch, his above-average slider became an arguably an above-average-to-plus pitch, and his above-average changeup became arguably an above-average-to-plus pitch. Only his curveball, which was a fringe-average offering, did not improve.
His slider is his main strikeout pitch, be it his upper-80 gyro variant with tight break or his low-to-mid-80s sweeping variant. Both pitches tunnel excellently with his fastball and fool batters, with short slice with his gyro slider to longer, more planar movement with his sweeper. His changeup sits in the mid-80s and tunnels well with his fastball as he maintains his arm speed well. While he is able to generate strikes and strikeouts with it, the pitch more often induces ground balls from weak contact. His curveball sits in the upper-70s-to-low-80s with 12-6 break, though sometimes it can get less top-down and become slurvy. While he can bury it below the zone for strikeouts, it is a soft, floaty pitch and is mainly used as a get-me-over offering.
The right-hander generally relies on his fastball to get ahead of batters and into two-strike counts. Against left-handers, despite having an excellent changeup, he generally relies on his fastball as his main strikeout pitch, switching to his slider and changeup at almost a half and a quarter of the time comparatively. Against right-handed batters, once he is in a two-strike situation, he uses his fastball and slider almost at equal percentages.