Around the horn: Orioles manager Buck Showalter said that there is a possibility that RHP Darren O'Day (hamstring strain) starts a minor league rehab assignment over the all-star break, but given the slow pace of O'Day's recovery, that doesn't currently appear likely. "Anything's possible," Showalter said. "We haven't gotten that far to make those plans. This is not a good injury. It's something that takes time. If you push it, you could miss a whole year." … Right-hander Chris Tillman will start in Sunday's final game before the All-Star break. … First-round pick RHP Cody Sedlock was added to the short-season Class-A Aberdeen roster on Tuesday. Since signing with the team last month, Sedlock had been working out and throwing pen sessions at the Orioles' spring training facility in Sarasota.