Jake Arrieta has thrown 14,063 pitches that have been tracked by the PITCHf/x system between 2008 and 2016, including pitches thrown in the MLB Regular Season and the MLB Postseason. In 2016, he has relied primarily on his Sinker (95mph) and Slider (90mph), also mixing in a Curve (81mph). He also rarely throws a Fourseam Fastball (94mph) and Change (89mph).
Basic description of 2016 pitches compared to other RHP:
His sinker has well above average velo, has little sinking action compared to a true sinker and results in somewhat more groundballs compared to other pitchers' sinkers. His slider is thrown extremely hard, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sliders, has short glove-side cut and has less than expected depth. His curve generates a high number of swings & misses compared to other pitchers' curves, has a sharp downward bite and is slightly harder than usual. His fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, results in more flyballs compared to other pitchers' fourseamers, has slightly above average velo, has slightly less natural movement than typical and has some added backspin. His 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.