Yoenis Cespedes hit a go-ahead homer in the eighth inning to move Oakland a win closer to the club's first playoff berth in six years, and the Athletics beat the Seattle Mariners 5-2 on Sunday to stay right on the heels of Texas in the AL West race.
Cespedes also hit an RBI triple and Moss had a sacrifice fly in the first inning for the A's, who pulled within 1 1/2 games of Texas. The Rangers were playing Game 2 of a doubleheader at home Sunday night against the Angels.
The two-time reigning AL champion Rangers come to the Coliseum for the final three games starting Monday with the division crown still up for grabs.
Oakland (91-68) leads Los Angeles by 2 1/2 games for the second AL wild card.