Although he has not thrown an MLB pitch in 2020, Junior Guerra threw 6,898 pitches that were tracked by the PITCHf/x system between 2015 and 2019, including pitches thrown in the MLB Regular Season, the MLB Postseason and Spring Training. In 2019, he relied primarily on his Fourseam Fastball (95mph), Sinker (95mph) and Splitter (86mph), also mixing in a Curve (82mph). He also rarely threw a Slider (85mph).
Basic description of 2019 pitches compared to other RHP:
His fourseam fastball generates more whiffs/swing compared to other pitchers' fourseamers, results in somewhat more flyballs compared to other pitchers' fourseamers, has slightly above average velo, has slightly less natural movement than typical and has some added backspin. His sinker has well above average velo and has little sinking action compared to a true sinker. His splitter is slightly firmer than usual and has movement that suggests a lot of backspin. His curve generates a high number of swings & misses compared to other pitchers' curves, is much harder than usual, has primarily 12-6 movement and results in somewhat more flyballs compared to other pitchers' curves. His slider (take this with a grain of salt because he's only thrown 8 of them in 2019) generates an extremely high number of swings & misses compared to other pitchers' sliders, has exceptional depth and is an extreme flyball pitch compared to other pitchers' sliders.