The changeup has been good to Eduardo Rodriguez. Very good. In fact, it’s one of his best pitches. Last season he saw hitters manage just a .254 wOBA and a .265 xwOBA (expected). This season the wOBA against is .311 and the expected version is .274. It has been his highest wiff percentage pitch in both of the last two seasons at 38.6 and 35.3% respectively. These figures are taken from his Baseball Savant player page, for those curious. What do they mean?
wOBA is weighted on base average. It’s a composite offensive statistic, similar to OPS.