Kopech (3-2) allowed two runs on two hits while striking out one over one inning of relief to take the loss Thursday against Oakland.
Kopech entered a tie game to begin the seventh inning and nearly got out of it, but a shaky decision by first baseman Andrew Vaughn extended the frame and led to a two-out, two-run home run by Matt Olson -- Vaughn ranged far to his right for a grounder to begin the frame, then threw wildly from his knees to Kopech covering first base on a play that was ruled a hit. The right-hander then got the next two batters out before Olson's dinger. Kopech remains a trusted bullpen arm that's posted a 2.74 ERA with 68 strikeouts over 49.1 innings.