Although he has not thrown an MLB pitch in 2015, Collin McHugh threw 3,687 pitches that were tracked by the PITCHf/x system between 2011 and 2014, including pitches thrown in the MLB Regular Season and Fall/Winter Ball. In 2014, he relied primarily on his Fourseam Fastball (92mph), Slider (87mph) and Curve (74mph), also mixing in a Change (84mph). He also rarely threw a Sinker (92mph) and Slow Curve (57mph).
Basic description of 2014 pitches compared to other RHP:
His fourseam fastball has essentially average velo. His slider generates fewer whiffs/swing compared to other pitchers' sliders and has less than expected depth. His curve has below average velo, generates more whiffs/swing compared to other pitchers' curves, has a sharp downward bite, results in somewhat more groundballs compared to other pitchers' curves and has slight glove-side movement. His change results in somewhat more groundballs compared to other pitchers' changeups. His sinker is basically never swung at and missed compared to other pitchers' sinkers, has less armside run than typical, has little sinking action compared to a true sinker and results in somewhat more groundballs compared to other pitchers' sinkers. His slow curve (take this with a grain of salt because he's only thrown 1 of them in 2014) is a real yakker that's separated from his other curveball due to its big drop and slow speed.