The Rangers recalled Corniell from Triple-A Round Rock on Saturday.
After making just one prior appearance with the big-league club this season back on June 23, Corniell is back with Texas. With Round Rock, the 23-year-old posted a 6.37 ERA, 1.74 WHIP and 27:16 K:BB in 35.1 innings. The Rangers optioned Emiliano Teodo to make room for Corniell on the active roster.