OAKLAND, Calif. (AP) - Derek Norris singled up the middle with two outs and the bases loaded in the 10th inning against former Oakland closer Grant Balfour, and the Athletics beat the Tampa Bay Rays 3-2 on Monday night.
Norris notched his second career game-ending RBI against Balfour (1-4) in Oakland's eighth walkoff win.
The AL West-leading A's remained one game ahead of the Los Angeles Angels and avoided losing consecutive home games for just the second time this season.
The A's loaded the bases against Balfour, who received a mound visit before Brandon Moss stepped in with a chance at a fourth grand slam but struck out. Norris delivered with his first game-ending RBI since June 24, 2012, against the Giants.
Rays manager Joe Maddon was ejected by first base umpire Quinn Wolcott during the inning and rushed the field to argue.
Ryan Cook (1-1) earned the win on a night the A's left stranded 18.