Sewald (2-1) took the loss Tuesday against Oakland after allowing three runs on a hit and two walks without recording an out.
Sewald was one of three pitchers Seattle deployed in a seventh inning that saw Oakland score six times. He entered with a one-run lead and a runner on third, and promptly allowed a single followed by two walks before being removed. Daniel Zamora came in and allowed all three runners to score, which resulted in a disastrous outing for Sewald, whose ERA quadrupled from 1.00 to 4.00.