"My plan was to be aggressive and get a good one," said Davis, whose three-run homer in the first staked the A's to a 3-0 lead. His third-inning homer put the A's up 4-3.
It is Davis' 13th multi-home run of his career and second of the season. Davis homered twice on Opening Day against the Angels.
"We need him, he's a big part of our lineup," A's manager Bob Melvin said. "You don't want to put too much pressure on one guy, but certainly a lot revolves around the middle of your order and he's the guy in the middle of the order.