The Mariners optioned Davila to Triple-A Tacoma on Sunday.
Davila allowed a run over 1.1 innings during Saturday's game against the Rangers and will now head to Triple-A in favor of a fresh bullpen arm. The 27-year-old rookie has a 3.57 ERA and 1.19 WHIP over 22.2 innings this year, though his 9:11 K:BB paints a less-encouraging outlook of his performance.