Oakland Athletics defeat Boston Red Sox, 6-4

OAKLAND, Calif. — As Bill Hall crossed first base in the sixth inning, the ball having arrived just before he did, the Red Sox second baseman removed his helmet and slammed it to the ground.

The helmet came to rest harmlessly in Oakland-Alameda County Coliseum, a place that housed the Sox’ frustrations over the last two games.

He wasn’t the only one to act out. Just before Hall grounded into the double play that ended the sixth, an inning that had started with three str...