Mengden gets all the run support for first big league win

Oakland Athletics' Coco Crisp, left, scores past San Francisco Giants catcher Buster Posey as umpire Will Little watches during the seventh inning of an interleague baseball game in San Francisco, Monday, June 27, 2016. (AP Photo/Jeff Chiu)
Jeff Chiu/AP

SAN FRANCISCO (AP) Daniel Mengden pitched into the eighth inning for his first major league win, backed by Marcus Semien's three-run homer and four RBIs, and the Oakland Athletics beat the San Francisco Giants 8-3 on Monday night to open the Bay Bridge Series.

Semien connected in the decisive second and Jed Lowrie and Khris Davis added RBI doubles against Jeff Samardzija (8-5) in that five-run inning, then Semien added a run-scoring double in the sixth. Davis hit an RBI single in the seventh.

Mengden (1-3) retired the first 13 batters in order before Angel Pagan's one-out single in the fifth. He called it a day after loading the bases in the eighth and losing his shutout bid.

The right-hander had pitched well enough to win during his initial three major league starts but received only four runs of support combined. He had more than that when he took the ball to start the bottom of the second, leading 5-0.