Already dealing with several injury-related roster questions, the Orioles played Wednesday night without second baseman Brian Roberts, who has been experiencing headaches since his headfirst slide to lead off Monday's game in Boston.

Roberts was scheduled to see team doctors before Wednesday's game to determine the cause of his latest health issue. The Orioles will proceed with caution; he missed the final six games of the 2010 season because of headaches

"Let the doctors put their arms around it," Orioles manager Buck Showalter said. "They just got here to look at it. Before making any evaluations, he's had some headaches and had trouble sleeping the last couple nights. So before we go forward with it, we want to get it checked out."

Roberts starting experiencing headaches late last season after hitting himself in the helmet with his bat following a strikeout against the Tampa Bay Rays on Sept. 27. The concussion symptoms persisted more than a month into the offseason.

It's too early to say whether the headfirst slide Monday is causing the headaches. Roberts, who wasn't available for comment before the game, was sidelined this spring with back discomfort after he slid headfirst into first base in a Grapefruit League game.