Although he has not thrown an MLB pitch in 2021, Ernesto Frieri threw 5,351 pitches that were tracked by the PITCHf/x system between 2009 and 2017, all of them occuring in the MLB Regular Season. In 2017, he relied primarily on his Fourseam Fastball (94mph) and Slider (83mph), also mixing in a Change (85mph).
In 2017, compared to other RHP:
His fourseam fastball results in more flyballs compared to other pitchers' fourseamers, has slight armside run and has slightly above average velo. His slider is a real worm killer that generates an extreme number of groundballs compared to other pitchers' sliders, is basically never swung at and missed compared to other pitchers' sliders and has some two-plane movement. His change (take this with a grain of salt because he's only thrown 7 of them in 2017) is basically never swung at and missed compared to other pitchers' changeups, results in more flyballs compared to other pitchers' changeups, has slight armside fade and has some natural sink to it.