Washington Nationals
Although they have not thrown an MLB pitch in 2025, George Kontos threw 5,503 pitches that were tracked by the PITCHf/x system between 2011 and 2018, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2018, they relied primarily on their Cutter (87mph) and Sinker (90mph), also mixing in a Slider (84mph). He also rarely threw a Fourseam Fastball (90mph) and Change (84mph).
In 2018, compared to other RHP:
Their cutter results in somewhat more groundballs compared to other pitchers' cutters, has slightly below average velo and has some natural sink. Their sinker results in somewhat more flyballs compared to other pitchers' sinkers, has slight armside run, has slightly below average velo and has some natural sinking action. Their slider generates a very high amount of groundballs compared to other pitchers' sliders, has short glove-side cut and has some two-plane movement. Their fourseam fastball (take this with a grain of salt because they've only thrown 9 of them in 2018) generates an extremely high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has below average velo, has some natural sinking action and has slightly less natural movement than typical. Their change (take this with a grain of salt because they've only thrown 8 of them in 2018) results in somewhat more flyballs compared to other pitchers' changeups and has slight armside fade.