Brian Matusz talks with the media about his bad outing in the O's loss
Rosales went three for four with 4 RBI to tie his career high as Oakland improved to 6-14 on the road. The A's are 17-4 in their last 21 games at Camden Yards.
Garrett Atkins hit a solo homer in the third off winning pitcher Trevor Cahill for the only O's run. It was his first homer of the year and ended a stretch of 145 homerless at bats, one shy of his career worst mark.
Adam Jones went 1 for 4 with an infield single to extend his career-best batting streak to 12 games, during which he is hitting .311. Nick Markakis went 0 for 4 as his eight-game hitting streak ended.
The Orioles were held to three hits and fall to 15-32. In the series finale, Thursday at 7:05, Brad Bergesen (3-3, 6.10) faces Gio Gonzalez (5-3, 3.46).