As the Orioles tried to figure out their convoluted pitching situation, they were faced with another roster challenge when leadoff hitter and second baseman Brian Roberts was taken to a local hospital on Friday night to have tests taken on his stomach. Roberts, one of the biggest reasons for the Orioles' 5-1 start because of his .280 average, two homers and team-leading eight RBI, was scratched about 20 minutes before Friday night's originally scheduled first pitch in the series opener against the Texas Rangers at Camden Yards. The Orioles aren't sure what is ailing Roberts, but decided to use caution. The game was ultimately postponed by rain and will be played as part of a straight single-admission doubleheader on Saturday with the first game starting at 4:35?p.m. Rookie left-hander Zach Britton will start the first game against the Rangers' Colby Lewis, while Jake Arrieta will go in Game 2 against left-hander Matt Harrison. It is unknown at this point if Roberts, who was limited to 59 games last season because of a herniated disk in his back and dealt with neck and back problems for much of the spring, will be available for Saturday's doubleheader, further complicating the roster dilemma for Manager Buck Showalter and President of Baseball Operations Andy MacPhail.