Quintana faced nine batters and didn't get any outs, allowing nine runs, seven hits and two walks.
Oakland starter Jesse Chavez improved to 4-0, giving up two runs and six hits in 4 2/3 innings. A's manager Bob Melvin indicated before the game that Chavez and Tommy Milone will be part of the team's starting rotation.
"Watching those guys run around the bases was awesome," said Chavez, who didn't see himself as a potential starter as he entered training camp. "I just came in prepared to battle for a job. That's all. It gives me more confidence that they have confidence that I can do it. I'm going to try and ride that wave of their confidence in me."