Rosenthal’s changeup made an appearance only 3.5% of the time in 2019, his least-used pitch. That’s probably because it’s 23 inches of break is below average and he really struggled to find the zone when he did throw it — eight of the 14 he threw landed in the waste or chase zone and garnered zero swings.
Plain and simple, the four-seamer is Rosenthal’s bread-and-butter, but it was flat-out hittable in 2019, despite averaging 98mph. He managed a 29.5% whiff rate, even with below-average ride, but was torched to the tune of a .438 wOBA when opposing batters made contact.
Rosenthal’s slider, which moves more vertically than horizontally, generated less swing-and-miss than his fastball at 28.6%. However, batters were unable to square it up. The pitch allowed zero barrels or solid contact in 99 instances and had a wOBA of .207 in 2019.