Baltimore Orioles starting pitcher Chris Tillman left Sunday's game against the Yankees after three innings because of stiffness in his right elbow.
Tillman's velocity was down and he issued a walk in each of the first two innings, with Chris Dickerson belting a two-run homer in the second.
The severity of the injury was not immediately known, but losing Tillman for any period would be a blow to the Orioles' push for a postseason berth.
Before Sunday, Tillman was 6-1 with a 3.67 ERA in his last eight starts and was 7-2 with a 3.26 ERA for the season.
Randy Wolf made his Orioles debut when he replaced Tillman.