Non-MLB
Although they have not thrown an MLB pitch in 2024, Brian Matusz threw 9,162 pitches that were tracked by the PITCHf/x system between 2009 and 2017, including pitches thrown in the MLB Regular Season and Spring Training. In 2017, they relied primarily on their Fourseam Fastball (89mph), also mixing in a Slider (84mph), Change using a Circle Change grip (79mph) and Curve (77mph).
In 2017, compared to other LHP:
Their fourseam fastball generates an extremely high number of swings & misses compared to other pitchers' fourseamers, has less armside movement than typical, results in somewhat more flyballs compared to other pitchers' fourseamers and has slightly below average velo. Their slider (take this with a grain of salt because they've only thrown 10 of them in 2017) generates an extremely high number of swings & misses compared to other pitchers' sliders and results in more flyballs compared to other pitchers' sliders. Their change using a circle change grip (take this with a grain of salt because they've only thrown 9 of them in 2017) is basically never swung at and missed compared to other pitchers' changeups, has surprising cut action, is an extreme flyball pitch compared to other pitchers' changeups and has slightly below average velo. Their curve (take this with a grain of salt because they've only thrown 4 of them in 2017) is basically never swung at and missed compared to other pitchers' curves, is an extreme flyball pitch compared to other pitchers' curves, has little depth and has slight glove-side movement.