This marks the third time that the up-and-down Daley has been designated this season. The 32-year-old has appeared in a total of 14 1/3 innings with the Yankees, posting a 5.02 ERA with 10 strikeouts against six walks and one hit batter. In 100 2/3 career innings between the Rockies and Yankees, Daley has a 4.47 ERA with a very solid 98-to-36 K/BB ratio, but his average fastball velocity dipped below 86 mph in 2014.
Mitchell, a 16th-round pick in 2009, will be making his big league debut the first time he takes the hill for the Yankees. He has a 4.27 ERA overall in the minors this season, but his numbers improved after jumping from Double-A Trenton to Triple-A. In 25 frames with Scranton/Wilkes-Barre, Mitchell notched a 2.88 ERA with a 21-to-10 K/BB ratio in five starts.