Double-A Columbus placed Hernandez on its 7-day injured list May 2 due to an unspecified injury.
Columbus deactivated Hernandez just two days after he delivered his best start of the season -- a seven-inning, nine-strikeout gem in which he allowed just one hit and no walks. For the season, Hernandez has compiled a 1.83 ERA, 1.30 WHIP and 29:12 K:BB across 19.2 frames.