That leaves the Orioles still looking for a starting pitcher for Saturday. The team called up right-hander Alex Burnett to take Gonzalez's spot on the 25-man roster, but he's likely just an additional bullpen arm.

Relievers Tommy Hunter and T.J. McFarland are options for that start, but Hunter wasn't completely stretched out in spring training — his longest Grapefruit League outing was 2 1/3 innings — and McFarland, the team's Rule 5 pick, hasn't pitched in eight days.

That leaves the most likely option at Triple-A Norfolk, where right-hander Steve Johnson is scheduled to start Saturday. The St. Paul's graduate allowed two runs on seven hits in 5 2/3 innings in his previous start for the Tides.

Roberts' surgery successful

Second baseman Brian Roberts had successful surgery to repair the semitendinosis muscle in his right hamstring Thursday in Dallas. The procedure was performed by Dr. Daniel Cooper.

"Everything went well," Showalter said. "It was very positive. The doctors felt good about getting it done after getting in there. It will speed up the process."

Roberts — who has played in just 118 games since the beginning of the 2010 season because of various injuries and is in the final season of a four-year, $40-million contract — is scheduled to return to his home in Sarasota, Fla., on Friday. He will rehab at the team's spring training facility there.

"We think he's worth waiting on," Showalter said. "It's been tough on him. It would be kind of selfish saying it's tough on us. It's tougher on him. … I know a lot of people will be sarcastic about what he's getting salary-wise. I understand how that works, but we look at it from a baseball standpoint. And he's a baseball player who wants to play baseball and be here and contribute with his teammates."

Around the horn

The Orioles acquired minor league infielder Brandon Wood from the Kansas City Royals on Thursday for cash considerations. Wood, 28, was once of the top prospects in baseball with the Los Angeles Angels, but he has a .186/.225/.289 line in 272 major league games. He will report to Norfolk, where he will add infield depth. Wood, who was hitting .264/.304/.396 in 16 games at Triple-A Omaha, can play all four infield positions. … The Orioles are ranked No. 1 in the lastest Yahoo! team rankings, published Thursday. … Down in Norfolk, first baseman Travis Ishikawa continues to heat up. With two hits Thursday afternoon, Ishikawa extended his hitting streak to 12 games, and he is batting .478 (22-for-46) with three homers, 15 RBIs and nine runs in that span. … Left-hander Zach Britton allowed three runs on five hits over 4 1/3 innings with six strikeouts and four walks for Norfolk on Thursday. He threw 96 pitches, 54 strikes.

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