KANSAS CITY, Mo. -- Josh Donaldson went deep, and Brandon Moss went the opposite way.

Donaldson homered twice and drove in four runs, and Moss matched his career high with four hits as the Oakland Athletics pounded out an 11-3 victory over the Kansas City Royals on Tuesday night.

The Royals' eight-game winning streak ended.

The A's bashed a season-high 20 hits, with seven players contributing multi-hit games. That made it easy for left-hander Jon Lester to pick up his third consecutive victory since being acquired in a July 31 trade with the Boston Red Sox.

Lester (13-7) struck out nine and gave up three runs on six hits and two walks in six innings.

"It's great," Lester said of the run support. "Guys are swinging the bats really well since I've been here. Hopefully we can continue to do that."

Donaldson, who upped his homer total to 25, belted out Bruce Chen pitches in the seventh and eighth innings.

The A's banged out 11 hits and jumped to a 6-0 lead through five innings, chasing Royals right-hander Jeremy Guthrie (8-10).

"I didn't make very good pitches with two strikes, especially early in the game," Guthrie said. "I gave up a couple of 0-2 hits and 1-2 hits. I don't think I mixed it up well enough tonight to keep them off balance. They were able to put it in play for hits.

"They are a very good team, one through nine they swing the bat well and swing it with power. They can put together a long inning. Obviously, their pitching staff is probably as good as any team in the league right now."

Donaldson, the third baseman who extended his hitting streak to nine games, singled home a run in the third and added a sacrifice fly in the fifth.

Left fielder Moss had three hits off Guthrie, including a run-producing double in the first. That hit scored center fielder Sam Fuld, who singled on an 0-2 pitch to start the game. Moss' third-inning single scored Donaldson. Moss also had a bunt single in the fifth to beat the Royals' shift.

"I told him, 'I don't even know you anymore,'" A's manager Bob Melvin said. "They had to point him out to me in the locker room after the game. He's been working hard at it.

"When you're struggling some, you try to track the ball a little bit deeper and get a better look at it. With that comes some balls hit the other way. Couple that with a bunt and you're on your way to making them move the field on you.

"He knows what we think. We talk to him about doing that sort of thing to scoot the field around for him, but you have to be comfortable doing it."

First baseman Stephen Vogt contributed a RBI single with two outs in the fifth to finish Guthrie's night. Guthrie, who won his previous three starts, gave up 11 hits, matching his season high, while retiring only 14 of the 24 batters he faced.

Four of the six runs Guthrie allowed were earned.

The Royals cut the lead in half with three runs in the fifth off Lester, who struck out the side in the fourth and yielded just two hits in the first four innings.

Kansas City catcher Salvador Perez rapped an RBI double in the fifth, and right fielder Nori Aoki's infield single scored Lorenzo Cain, who had doubled. Shortstop Alcides Escobar's sacrifice fly scored third baseman Mike Moustakas, who led off the inning with a walk. That cut the Athletics' lead to 6-3.

"I thought Lester pitched better today than he did in Oakland," Royals manager Ned Yost said. "He was spotting the ball better, had better command of his fastball, had better command of his curveball. I thought he threw the ball well.

"They got the pitch count up (40 pitches in two innings). Normally three runs against Lester the way we've been going would have kept us in the game, but they found a bunch of holes on us and scored some runs."

NOTES: The Royals placed LHP Scott Downs on the 15-day disabled list with a stiff neck to clear a roster spot for DH Josh Willingham, who was acquired in a trade Monday and was in the lineup Tuesday. Downs had not pitched since Aug. 2. Willingham went 1-for-4 in his Kansas City debut. ... An MRI revealed A's SS Jed Lowrie has a hairline fracture on his right index finger, but he hopes he can play through it and avoid going on the disabled list. Lowrie, who sat out Tuesday, injured the hand Aug. 4 fielding a grounder. He played four games with the injury. ... Royals LHP Jason Vargas will make his third start Wednesday after an appendectomy last month. The A's will counter with LHP Scott Kazmir, who is tied for the AL lead with 13 victories.