Jake Arrieta has thrown 22,766 pitches that have been tracked by the PITCHf/x system between 2008 and 2019, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2019, he has relied primarily on his Sinker (93mph), also mixing in a Change (88mph), Slider (91mph) and Curve (81mph). He also rarely throws a Fourseam Fastball (93mph).
Basic description of 2019 pitches compared to other RHP:
His sinker generates more whiffs/swing compared to other pitchers' sinkers and has slight armside run. His change has an obvious armside fade, dives down out of the zone, is much firmer than usual and results in more flyballs compared to other pitchers' changeups. His slider is thrown extremely hard, is basically never swung at and missed compared to other pitchers' sliders, is an extreme flyball pitch compared to other pitchers' sliders, has much less depth than expected and has primarily 12-6 movement. His curve is basically never swung at and missed compared to other pitchers' curves, is slightly harder than usual and has slight glove-side movement. His fourseam fastball (take this with a grain of salt because he's only thrown 12 of them in 2019) generates a high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers, has essentially average velo and has slight armside run.