Paxton was optimistic it was a minor injury, but an MRI on Friday morning confirmed a stint on the disabled list and another blow for the Mariners' postseason chances.
The Mariners have already used a whopping 15 different starting pitchers in 2017 and losing Paxton for any length of time is worrisome as they find themselves in the thick of a playoff race.
Mike Trout provided the capper to a miserable night for the Seattle Mariners. But just another rare injury that is pretty uncommon with pitchers. "I've said it over and over".
Trout's bases-clearing hit off Seattle closer Edwin Diaz (2-5) came after the Mariners staged a three-run rally of their own in the eighth inning to tie the game at 3-all. He began a rehab assignment in his recovery from a facial laceration suffered July 22 when hit in the face by a pitch from Jacob deGrom of the New York Mets.
Add Paxton's pectoral strain to Felix Hernandez's shoulder bursitis, Hisashi Iwakuma's shoulder inflammation and Drew Smyly's Tommy John surgery, and it's hard to picture a playoff scenario where the Mariners take the rest of the American League by storm - or at all. But he was not sharp in his attempt at No. 8 and could be headed to the disabled list for the second time this season. No doubt. It's been a insane season with all the injuries.
Paxton was pulled in the middle of an at-bat to Kole Calhoun. Marte took the roster spot of RHP Troy Scribner, who was optioned after Wednesday's game. Offensively, Robinson Cano leads the Mariners with 115 hits and 75 RBI while Nelson Cruz and Jean Segura have combined for 228 hits and 126 RBI. Iwakuma is expected to throw an extended bullpen session on Friday.
Mariners starter Marco Gonzales was lifted with one out in the fifth after a pair of hard-hit singles.
The Mariners sent rookie Andrew Moore to Class AAA Tacoma and recalled veteran Christian Bergman before Saturday's game.
Nolasco escaped with a no-decision against Oakland in his last turn despite allowing five runs and nine hits over four innings.