Patrick Corbin surrendered a pair of runs on four hits in a losing effort to the Rockies in his Cactus League debut Friday. Corbin walked one and struck out a pair in his four innings of work. All of the damage against him came on a two-run blast off the bat of Ryan Casteel in the third inning. The young southpaw enters the season as the ace of the D'Backs staff after a breakthrough campaign in 2013.