Hernandez has 63 holds since joining the D-backs in 2011, tied for the fifth-highest total among National League relievers. A hold for a setup man is determined using the same criteria as a save for a pitcher who finishes a game. He is the third Arizona reliever with 60 or more strikeouts in three straight seasons, joining Byung-Hyun Kim (2000-02) and Jose Valverde (2005-07).
Hernandez struggled though much of llast season and was sent down to Triple-A Reno, but after being recalled in September, he did not allow a run in 10 of his 12 appearances. Overall, he gave up just two runs on six hits in the month. This spring, he had a 2.16 ERA with five strikeouts in eight innings.
Without Corbin and Hernandez, the Diamondbacks' pitching staff is in a bit of flux. Assuming Randall Delgado moves into the starting rotation to join Wade Miley, Trevor Cahill, Brandon McCarthy and Bronson Arroyo, the D-backs could open the season with the expected seven bullpen arms -- closer Addison Reed, setup men J.J. Putz and Brad Ziegler, long reliever Josh Collmenter, left-handers Oliver Perez and Joe Thatcher and middle reliever Will Harris.
In another scenario, right-hander Bo Schultz could remain on the 25-man roster if the D-backs open with 13 pitchers, both as an extra bullpen arm and as a possible starting candidate if the D-backs believe Arroyo needs a little more time for his back to fully heal. Arroyo's Saturday start against the Cubs will be a good test. Schultz was named to the 25-man roster for the season-opening series against the Dodgers in Australia and made his major league debut with a shutout inning in relief in the second game.
The Diamondbacks will have a week or so to play with their final roster spot while Cody Ross remains on the disabled list. He is eligible to return April 4, but the D-backs will proceed with caution.
FOXSportsArizona.com's Jack Magruder contributed to this report