Stephen Strasburg has thrown 16,675 pitches that have been tracked by the PITCHf/x system between 2009 and 2017, including pitches thrown in the MLB Regular Season, the MLB Postseason and Fall/Winter Ball. In 2017, he has relied primarily on his Fourseam Fastball (96mph) and Curve (83mph), also mixing in a Change (89mph) and Slider (91mph).
Basic description of 2017 pitches compared to other RHP:
His fourseam fastball has well above average velo and has slight armside run. His curve generates a very high amount of groundballs compared to other pitchers' curves, generates more whiffs/swing compared to other pitchers' curves, is much harder than usual and has slight glove-side movement. His change is thrown extremely hard, generates an extremely high number of swings & misses compared to other pitchers' changeups, has slight armside fade and has some natural sink to it. His slider is thrown extremely hard, is basically never swung at and missed compared to other pitchers' sliders, has much less depth than expected and has primarily 12-6 movement.