Seattle Mariners
George Kirby has thrown 11,118 pitches that have been tracked by the PITCHf/x system between 2022 and 2026, including pitches thrown in the MLB Regular Season and Spring Training. In 2026, they have relied primarily on their Fourseam Fastball (97mph) and Sinker (97mph), also mixing in a Slider (87mph), Change (89mph) and Curve (84mph). He also rarely throws a Cutter (94mph) and Splitter (85mph).
In 2026, compared to other RHP:
Their fourseam fastball is blazing fast, generates more whiffs/swing compared to other pitchers' fourseamers and has some natural sinking action. Their sinker is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sinkers, is thrown at a speed that's borderline unfair, has slight armside run and has some natural sinking action. Their slider sweeps across the zone, has exceptional depth, generates fewer whiffs/swing compared to other pitchers' sliders, results in more flyballs compared to other pitchers' sliders and is much harder than usual. Their change is thrown extremely hard, generates more whiffs/swing compared to other pitchers' changeups, has slight armside fade and has some natural sink to it. Their curve is thrown extremely hard, has an exceptional bite, is basically never swung at and missed compared to other pitchers' curves and results in more flyballs compared to other pitchers' curves. Their cutter (take this with a grain of salt because they've only thrown 10 of them in 2026) is thrown at a speed that's borderline unfair, is an extreme flyball pitch compared to other pitchers' cutters and has little cutting action. Their splitter (take this with a grain of salt because they've only thrown 3 of them in 2026) has dives down out of the zone, is basically never swung at and missed compared to other pitchers' splitters and is an extreme flyball pitch compared to other pitchers' splitters.