Swanson (2-1) took the loss Wednesday against the Athletics. He allowed two runs on two hits and a walk without recording an out.
It was a disastrous outing for Swanson, who failed to record an out after he was called upon in the bottom of the seventh. He surrendered a leadoff walk to Jordan Diaz to begin the inning and then allowed back-to-back hits to put the Mariners down 2-0 before getting pulled. After not allowing a run through all of August, Swanson has now given up four runs in September but still sports a solid 1.49 ERA and 0.89 WHIP on the season.