Although he has not thrown an MLB pitch in 2019, Daniel Mengden threw 3,727 pitches that were tracked by the PITCHf/x system between 2016 and 2018, all of them occuring in the MLB Regular Season. In 2018, he relied primarily on his Fourseam Fastball (93mph), also mixing in a Slider (84mph), Sinker (93mph), Change (83mph) and Curve (73mph). He also rarely threw a Cutter (88mph).
Basic description of 2018 pitches compared to other RHP:
His fourseam fastball has essentially average velo, has slightly less natural movement than typical and has some added backspin. His slider has some two-plane movement. His sinker has surprisingly little armside run, generates fewer whiffs/swing compared to other pitchers' sinkers, results in somewhat more flyballs compared to other pitchers' sinkers and has virtually no sinking action reminiscent of a true sinker. His change is basically never swung at and missed compared to other pitchers' changeups and has slight armside fade. His curve has an exceptional bite and has below average velo. His cutter has heavy sink, results in somewhat more flyballs compared to other pitchers' cutters and has strong cutting action.