Chicago Cubs
Although they have not thrown an MLB pitch in 2024, C.J. Riefenhauser threw 361 pitches that were tracked by the PITCHf/x system between 2014 and 2016, including pitches thrown in the MLB Regular Season and Spring Training. In 2016, they relied primarily on their Fourseam Fastball (90mph) and Change (81mph), also mixing in a Slider (76mph).
In 2016, compared to other LHP:
Their fourseam fastball (take this with a grain of salt because they've only thrown 9 of them in 2016) has heavy sinking action, is straight as an arrow, generates a high number of swings & misses compared to other pitchers' fourseamers, is an extreme flyball pitch compared to other pitchers' fourseamers and has essentially average velo. Their change (take this with a grain of salt because they've only thrown 4 of them in 2016) generates an extremely high number of swings & misses compared to other pitchers' changeups, has surprising cut action and is an extreme flyball pitch compared to other pitchers' changeups. Their slider (take this with a grain of salt because they've only thrown 2 of them in 2016) comes in below hitting speed, is basically never swung at and missed compared to other pitchers' sliders, sweeps across the zone, has exceptional depth and results in more flyballs compared to other pitchers' sliders.