In the opener, Steve Pearce had three hits and two RBIs in his return to the Orioles, who got a home run from Nick Markakis in a 5-1 win.
The single-admission doubleheader followed consecutive rainouts on Tuesday and Wednesday. The rain lingered long enough to delay the fifth inning of the opener by 21 minutes, and the start of the nightcap was stalled 46 minutes by rain.
The second game marked the season debut of Orioles third baseman Manny Machado, who had left knee surgery in October. After sitting out the opener, Machado received a warm ovation from the crowd of 28,290 before the second game and went 0 for 5.