The Mariners optioned Davila to Triple-A Tacoma on Friday.
Davila has given up four runs (three earned) in 3.2 innings since coming up from Triple-A on Aug. 7. Now sporting a 4.10 ERA and 1.22 WHIP across 26.1 major-league innings on the season, the 27-year-old will head back to the minors to make room for Carlos Vargas (lat), who returned from the IL in a corresponding move. Davila could still return to make a few more appearances down the stretch for Seattle whenever the big club needs fresh bullpen depth.