Mariners' homegrown rotation showing mixed 2026 results
Kirby (2.94 ERA, 0.267 xwOBA) remains elite, but Gilbert (4.29 ERA, 0.343 xwOBA) and Woo (4.02 ERA, 0.300 xwOBA) have regressed significantly from their career norms, while surprise arm Hancock (2.59 ERA, 0.303 xwOBA) has been the rotation's most reliable performer.