SAN FRANCISCO -- Stephen Piscotty homered for the fifth time in nine games, and the Oakland Athletics beat the San Francisco Giants 6-2 on Sunday. All-Star second baseman Jed Lowrie walked and scored in his return to the lineup following a scary collision in right field two nights earlier for Oakland. Matt Chapmanadded two hits. All-Star shortstop Brandon Crawford had two hits for the Giants, who lost a home series for the first time since dropping two of three at AT&T Park to Arizona from April 8-10.