SAN FRANCISCO -- Daniel Mengden pitched into the eighth inning for his first major league win, backed by Marcus Semien's three-run homer and four RBI, 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.