Baltimore entered the day a half-game ahead of Detroit for the second AL wild card and trailed Toronto by 1 1/2 games for the top spot. The Orioles begin a crucial three-game series at the Blue Jays on Tuesday.
Baltimore finished the regular season 50-31 at Camden Yards. Arizona has been swept 13 times this season, including six on the road.
Orioles rookie Dylan Bundy (10-6) allowed the one run on three hits with five strikeouts over five innings. Bundy hasn't gone past the sixth inning in his past six starts.