The Arizona Diamondbacks have optioned left-hander Tyler Skaggs to Triple-A Reno, narrowing the list of candidates for the team's fifth starting spot.
Skaggs, fellow lefty Patrick Corbin and right-hander Randall Delgado had been vying for the final spot in the Arizona rotation. But Skaggs had struggled in outings this spring.
Corbin helped his status with a solid outing this week against San Diego.
The Diamondbacks also reassigned four players to minor league camp -- infielder Kila Ka'aihue, left-hander Rommie Lewis, catcher Rossmel Perez and outfielder Brad Snyder.
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