SEATTLE Yoenis Cespedes just feels more comfortable when he plays the outfield.
Cespedes homered twice, and Bartolo Colon won his seventh straight start to lead the A's past the Seattle Mariners 6-3 on Friday night.
Limited to designated-hitting duty for seven games because of a sore hamstring, Cespedes celebrated his return to left field with a pair of two-run homers.
"Evidently he likes to play the outfield," Oakland manager Bob Melvin said. "You could see his whole demeanor today, he was just in a better mood."
Jed Lowrie and Coco Crisp also went deep for the A's, who maintained their one-game lead in the American League West over the Texas Rangers.
Cespedes homered in the first inning and again in the ninth for his third career multihomer game all this month, and all when playing left field.
"I can't say I'm 100 percent yet, but it feels great to play in the outfield," Cespedes said through a translator. "When I'm in the outfield, my body's completely up, my body's on fire. The difference is when I'm a DH and I sit down in the dugout and I'm doing nothing, I feel like I'm going down a little bit."
Cespedes' hitting took some of the spotlight off Colon's pitching, but the 40-year-old right-hander was on top of his game, too. Colon (10-2) gave up three runs and seven hits over eight innings, tying unbeaten Max Scherzer of the Detroit Tigers for most wins in the A.L.
Colon is 11-1 in his career at Safeco Field, the best record for any pitcher with at least seven decisions in the Mariners' home park.
"He's a veteran guy. He knows himself. He knows what works," said Crisp, who hit a solo homer in the sixth. "It's not a fluke."
Grant Balfour worked the ninth for his 18th save this season and 36th in a row dating to May 5, 2012.