The Red Sox, winners of five of their last six, pushed their American League East lead back to four games over the Yankees following New York’s loss to 2-1 loss to Tampa Bay.
Betts went 3 for 5 with six RBIs. He’s driven in three runs or more in a team-high 11 games.
The loss snaps a five-game win streak for the A’s. They managed just one run and one hit off Eduardo Rodriguez (5-5), who struck out nine over six innings.
Sean Manaea (10-10) was pulled after giving up seven earned runs on 11 hits in 3 2/3 innings.