Landon Powell homered in Oakland's four-run fourth inning, and the Athletics beat the Baltimore Orioles 6-3 on Wednesday to win a third straight series for the first time since April 2008.
Rookie Vin Mazzaro (4-8) allowed three runs, two earned, in 5 1-3 innings to post his second consecutive win after an eight-game skid.
Andrew Bailey worked a perfect ninth for his 17th save in 21 opportunities.
Cliff Pennington and Scott Hairston had three hits apiece for the last-place A's, who took two of three from Baltimore. After winning three of four from Texas and going 2-1 against Kansas City, Oakland has captured three successive series for the first time since besting KC, Minnesota and Seattle from April 18-27, 2008.