Athletics 12, Indians 7: Josh Reddick had three hits and three RBIs and was among four Oakland players to homer as the visiting Athletics completed a four-game sweep of reeling Cleveland.

Cliff Pennington hit a two-run homer and Coco Crisp and Josh Donaldson added solo shots to help Oakland extend its winning streak to six games and maintain its one-game lead over Baltimore atop the American League wild card race.

George Kottaras contributed a three-run double in a five-run fourth inning as the surging Athletics won for the 12th time in 14 games and made it eight straight victories over the Indians.

Jarrod Parker (9-7) survived five-plus shaky innings, yielding five runs on eight hits, as Oakland handed Cleveland its fifth consecutive loss and 14th defeat in 15 games.

Indians right-hander Justin Masterson (10-12) was pounded by the Athletics for the second time in 12 days, allowing eight runs and a season-high three homers in four-plus innings.

Shin-Soo Choo drove in three runs and Jason Kipnis homered and had two RBIs for the Indians, who fell to a woeful 5-23 in August with one game left in the month.

Kottaras' bases-clearing double and Pennington's two-run shot made it 6-1 before Reddick hit a two-run homer in the fifth and added a sacrifice fly in the sixth for a 10-3 lead.

GAME NOTEBOOK: Reddick had his third three-hit game during a five-game hitting streak. He is batting .522 (12-for-23) in that span. ... Masterson allowed at least eight runs for the fifth time this year, tying the club record set by Mel Harder in 1936. He owned Cleveland's only two wins in the last 16 games. ... Parker's three base on balls snapped a 25-game string in which Oakland pitchers had allowed two walks or fewer. ... Indians C Carlos Santana was at DH Thursday, one day after he was pulled from a game for his lack of hustle. ... Indians pitching coach Ruben Niebla was ejected in the seventh for arguing balls and strikes. ... The Athletics head home to open a three-game series with the Boston Red Sox while Cleveland continues its 10-game homestand by hosting Texas for a three-game set.