Boston Red Sox
Although he has not thrown an MLB pitch in 2019, Joe Kelly threw 11,267 pitches that were tracked by the PITCHf/x system between 2012 and 2018, including pitches thrown in the MLB Regular Season and the MLB Postseason. In 2018, he relied primarily on his Fourseam Fastball (99mph), also mixing in a Curve
Basic description of 2018 pitches compared to other RHP:
His fourseam fastball is thrown at a speed that's borderline unfair and generates a very high amount of groundballs compared to other pitchers' fourseamers. His curve is thrown extremely hard and has an exceptional bite. His slider is thrown extremely hard, is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sliders, has exceptional depth and has short glove-side cut. His change generates an extremely high number of swings & misses compared to other pitchers' changeups, is much firmer than usual and has slight armside fade. His sinker is thrown at a speed that's borderline unfair and has little sinking action compared to a true sinker.