It was a forgettable season for Daniel Castano, who made just five major league appearances and four starts for the 2021 Marlins (0-2, 20.1 IP, 13 SO, 1.48 WHIP, 5.14 FIP). Injuries played a role in holding him back.
Castano’s strikeout rate climbed from his 2020 debut—from 9.5% to 14.1%—but that is still extremely low by current MLB standards. He spent most of his time in AAA Jacksonville (7-2, 3.91 ERA, 14 G, 78.1 IP, 54 SO, 1.09 WHIP). A shoulder impingement sidelined the big lefty for about 2 months. He was trending in the right direction late in the summer upon his return, completing 6+ innings in each of his final 6 AAA starts, including 8 scoreless innings in the Jumbo Shrimp’s season finale.