Burres allowed six singles in 5 1-3 scoreless innings, and the Orioles broke a six-game losing streak with an 8-1 victory over the Florida Marlins on Tuesday.
"The timing was good for him to do that," said Baltimore manager Dave Trembley, who earlier in the day announced that Burres and right-hander Matt Albers were the finalists to be the fifth starter. "We got 75 pitches out of him (and) his tempo was good."
The left-hander started in place of right-hander Jon Leicester, who was scratched from his scheduled outing and sent outright to Triple-A Norfolk on Tuesday morning.
Burres has been getting 1-on-1 instruction from Mike Flanagan, a former Cy Young Award winner who is the Orioles' executive vice president of baseball operations, and has learned a drop-down curve, which is effective against left-handed hitters.
"It's nice to go out there and have a good outing. I felt really good out there. ... I just want to throw strikes and get ahead and when I do go ahead not go 0-2 to 3-2. Make them hit the ball early," said Burres, who walked none and struck out four.
Orioles second baseman Brian Roberts sat out with a sore lower back and expects to miss at least a couple of days.
Left-hander Scott Olsen, who has battled shoulder problems this spring, made his first exhibition start for the Marlins and said he would be on target for an April 4 turn at home against Pittsburgh. He allowed six runs and eight hits, walked one and struck out three in four innings.
"That'll be the best thing I can take out of this one -- that I could go out there and pitch in the third and fourth," said Olsen, who gave up five runs in the second. "I came out healthy, threw a lot of strikes, located good for the most part. They put the ball in play. I'm not concerned at all."
"I really worked hard in the offseason. I have to regain my status. Things have gone real good this spring, but I still have to play good every day," said Cantu, who had 28 homers and 117 RBIs for Tampa Bay in 2005.