OAKLAND, Calif. — Catcher Stephen Vogt, right fielder Josh Reddick and shortstop Marcus Semien each homered, powering the Oakland A’s to a 9-2 victory against the Boston Red Sox on Tuesday night at the O.co Coliseum.

Left-hander Drew Pomeranz allowed two runs on four hits over seven innings for the A’s, who snapped their season-high, six-game losing streak. Pomeranz (2-3) ended his three-game skid and won for the first time since his first start of the season on April 10, when he threw seven shutout innings against the Seattle Mariners. He struck out three and walked none for the first time since his first start.

Vogt hit his team-high ninth home run of the season, a two-run shot in the first inning. He scored twice and drove in two runs, giving him an American League leading 30 RBIs for the season. Vogt matched his career high for homers in a season.

Reddick went 4-for-5 with his sixth home run of the season, a solo blast in the third. He drove in three runs, scored twice and raised his batting average to a team-high .346.

Semien hit a solo shot in the fourth, his sixth homer of the season. He also tripled and singled in five at-bats, finishing a double shy of the cycle. Second baseman Eric Sogard went 2-for-4 with a double and three RBIs.

Red Sox right-hander Justin Masterson (2-2) gave up six runs on six hits over 2 1/3 innings, his shortest outing of the season.

The A’s jumped on Masterson in the first inning, taking a 3-0 lead. With one out, Semien tripled high off the center field fence at the 400-foot mark, and Reddick brought him home with a single to right.

Vogt fell behind 0-2 but worked the count full and lined Masterson’s next pitch over the right field fence with two outs.

The A’s added a run in the second as third baseman Brett Lawrie led off with an infield single and scored on Sogard’s double.

Oakland scored three more times in the third and knocked Masterson out of the game. Reddick led off with a long home run to right. With one out, Masterson walked Vogt and was replaced by right-hander Steven Wright.

Wright walked first baseman Max Muncy and gave up a single to Lawrie, loading the bases. Sogard lined a two-run single to center.

Semien launched a leadoff homer to left off Wright in the fourth, his sixth of the season, making it 8-0.

Right fielder Shane Victorino doubled and scored Boston’s first run in the sixth, cutting Oakland’s lead to 8-1. Second baseman Dustin Pedroia went 2-for-3 with a double and scored a run in the seventh. First baseman Mike Napoli and catcher Blake Swihart each had an RBI.

NOTES: Red Sox RF Shane Victorino, who came off the disabled list Monday after recovering from a hamstring injury, made his second straight start, both against Oakland left-handed starting pitchers. … Boston LHP Wade Miley (1-4) will try to snap his three-game losing streak Wednesday when he faces Oakland RHP Sonny Gray (4-0) in the finale of the three-game series. Miley has a 6.91 ERA and hasn’t won since April 21 against the Tampa Bay Rays.