In the 2024 season, splitter usage among starting pitchers reached a 14-year high with a league-wide 3.2% usage, led by Kevin Gausman who maintained around 36% usage from 2021 to 2024. However, Roki Sasaki is poised to challenge Gausman’s dominance in 2025 with his highly anticipated splitter. The analysis of various pitchers’ splitter performance in terms of zone, swing, and whiff rates highlights the importance of this pitch in the upcoming season, with Gausman potentially facing competition for the top spot.
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