Karns earned his third win, pitching six-plus innings with three runs and six hits allowed, while A's starter Kendall Graveman (1-3) took the loss after yielding four runs on 10 hits and a walk in 6 1/3 innings.
MOMENTS THAT MATTERED
Marte makes 'em pay double: Mariners shortstop Ketel Marte made an outstanding catch in the second when he snared a hard line drive by Chris Coghlan as the ball was already nearly past him in his defensive shift up the middle, easily doubling Stephen Vogt off first to help Karns get out of early trouble after Davis' first homer.