Ryan Dempster had some extra rest and a slider that was working. This was more like the kind of performance from Dempster the AL West-leading Rangers were looking for when they traded for the right-hander three weeks ago. After giving up eight runs twice in his first three Texas starts, Dempster limited the surprising Baltimore Orioles to a first-inning run and allowed only four hits over eight innings in a 5-1 victory Monday night.