Although he has not thrown an MLB pitch in 2015, Roberto Hernandez threw 17,589 pitches that were tracked by the PITCHf/x system between 2007 and 2014, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2014, he relied primarily on his Sinker (91mph) and Change (84mph), also mixing in a Slider (85mph) and Fourseam Fastball (91mph). He also rarely threw a Curve (80mph).
Basic description of 2014 pitches compared to other RHP:
His sinker is a prototypical pitch with few remarkable qualities. His change results in somewhat more groundballs compared to other pitchers' changeups, has slight armside fade and has some natural sink to it. His slider is basically never swung at and missed compared to other pitchers' sliders, has less than expected depth and has primarily 12-6 movement. His fourseam fastball generates fewer whiffs/swing compared to other pitchers' fourseamers, results in somewhat more flyballs compared to other pitchers' fourseamers and has slightly below average velo. His curve (take this with a grain of salt because he's only thrown 2 of them in 2014) is basically never swung at and missed compared to other pitchers' curves, results in more flyballs compared to other pitchers' curves, has little depth, is slightly harder than usual and has primarily 12-6 movement.