Know Your Averages, Splitter Edition

The splitter’s usage among starting pitchers reached a 14-year high in the 2024 season when it hit a 3.2% usage league-wide. In the past four seasons, no qualified pitcher has taken the top splitter usage trophy away from Kevin Gausman who averaged around 36% usage from 2021 to 2024. Taijuan Walker came close in 2023 when he threw his splitter 33.2% of the time, yet it wasn’t enough to top the king. 2025 seems like the year in which Gausman will lose his crown. Roki Sasaki will be one of the most-watched pitchers in 2025 and according to some, will showcase one of the best splitters in the world. How often he’ll use that pitch remains to be seen. Shota Imanaga (30.6% usage) came close to King Gausman’s mark in 2024. In Yoshinobu Yamamoto’s 90 innings pitched in 2024, he threw his splitter 24.2% of the time. What will happen in 2025? Dare I suggest the league-wide splitter usage continues its growth and finishes at 4.1%? It’s possible. Only 12 qualified pitchers threw splitters in 2024. In this edition of “Know Your Averages”, I’ll bring in any pitcher who threw at least 45 splitters and compare their plate discipline metrics.
Fastballs: Four-seamers | Sinkers | Cutters
Breaking and Offspeed Pitches: Sliders | Changeups | Curveballs | Splitters | Sweepers
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