OAKLAND, Calif. -- Third baseman Danny Valencia and rookie first baseman Mark Canha have been two of baseball's hottest hitters for much of the past month.

The ice-cold Los Angeles Angels were no match for the duo and the rest of the Oakland A's on Monday night in the opener of a three-game series at the O.Co Coliseum.

Canha had a three-run homer and four RBIs, and Valencia drove in a total of three runs with two doubles, powering the A's to an 11-5 victory.

Canha hit .309 with 10 doubles, three homes runs and 21 RBIs over 25 games in August. Valencia has six doubles, five home runs and 17 RBIs in 20 games since being claimed by the A's off waivers from Toronto on Aug. 3.

"From the minute he got here, in the four spot every day, playing with a banged up knee," A's manager Bob Melvin said of Valencia. "Instrumental, and really, since he's gotten here, the offense has been a lot better."

Canha, a Rule 5 draft pick, is coming on strong down the stretch after becoming Oakland's everyday first baseman in the wake of Ike Davis' season-ending hip injury.

"It helps," Canha said of receiving regular playing time. "It makes it easier to just get in a rhythm, get feeling comfortable every day in the box."

Oakland (58-74) won its third consecutive game and sent Los Angeles to its fourth straight defeat and ninth loss in 11 games. The Angels (65-66) fell below .500 for the first time since June 10, when they were 29-30. They remain 3 1/2 games behind the Texas Rangers for the second wild-card spot in the American League.

"We need to get the rotation back to where it was, giving us a chance to win," Angels manager Mike Scioscia said. "We're in this. We need to do things just a little better."

A's left-hander Felix Doubront (2-1) gave up four runs on seven hits over six innings, earning his first win since being traded by the Toronto Blue Jays to the A's on July 31. He struck out five and walked four in his third start and fifth appearance for Oakland.

Doubront was hit in the right foot by a comebacker in his previous start, Aug. 24 at Seattle, and left after two innings. He missed his scheduled start Saturday.

"It was sore, but it was better than last week," Doubront said.

Angels left-hander Hector Santiago (7-9) lasted a season-low 2 2/3 innings and lost his fifth straight decision. He gave up five runs on four hits, struck out four and walked three.

"When things go wrong at this time of the year, they get amplified," Santiago said. "You try to think too much, try to make the perfect pitch. I felt like I was fighting myself mechanically."

Shortstop Erick Aybar went 3-for-3, drove in two runs and scored once for the Angels, who had 10 hits. First baseman Albert Pujols went 2-for-4 with a double, a walk, a run and an RBI.

The Angels built an early 3-0 lead, but the A's scored five times in the bottom of the third when Valencia hit a two-round double and left fielder Jake Smolinski added a bases-clearing double.

Canha hit his 11th home run of the season in the sixth inning off left-hander Jose Alvarez, crushing a 2-0 pitch over the left field fence with two outs to make it 9-3. It was his first home run off a left-hander this season.

"I got in a good hitters' count, so I just tried to a get a fastball and I timed it up perfectly," Canha said.

Angels center fielder Mike Trout walked with one out in the first and scored on Aybar's two-out single for a 1-0 lead.

Pujols beat out an infield single with one out in the third, moved to third on designated hitter C.J. Cron's single to right and scored on Aybar's sacrifice fly. Left fielder Shane Victorino singled Cron to third, and Cron scored on a double steal.

The A's answered with five runs in the bottom of the third to take a 5-3 lead.

Oakland made it 6-3 in the fifth. Lawrie reached on an error, and Valencia drove him in with a double off the base of the left field wall as the ball grazed the tip of Victorino's glove.

A panel in the wall came loose when Victorino backed into it, and play was stopped for 10 minutes to have it repaired as both teams left the field. The fence had to be taken down for the Oakland Raiders' exhibition game Sunday night, then put back for the A's game, less than 24 hours later.

"We had a malfunction out there," Valencia said, smiling.

NOTES: A's RHP Evan Scribner left the game after striking out Angels CF Mike Trout, who led off the ninth, because of tightness in his right lat. Scribner will undergo an MRI. He tore that muscle in 2011 while with the San Diego Padres and missed three months. ... Angels 3B David Freese (broken right index finger) will be activated from the disabled list Tuesday, manager Mike Scioscia said. ... A's RHP Chris Bassitt was scratched from his scheduled start Tuesday against the Angels because of right shoulder soreness. RHP Cody Martin will be called up from Triple-A Nashville to make his first major league start. ... Angels RHP Cory Rasmus, out since Aug. 14 due to a right forearm strain, threw a promising bullpen session Monday. "He's ready to go," Scioscia said.