Hensley broke from the mound to cover first base on a foul ball hit toward the right side by Washington leadoff hitter Felipe Lopez.
Hensley tried to stay in the game, taking a warmup pitch before wincing in pain. He then left the game and was replaced by Doug Brocail.
Hensley allowed a run in the first inning, but he retired the next five hitters he faced before Lopez fouled off a pitch on a 1-2 count. Lopez was the first batter he faced in the inning.
Earlier this season, Hensley had issues with a blister on his right middle finger. But he had pitched well after starting the season 0-3. He was 1-0 with a no-decision and a 2.92 ERA over his last two starts.
Corey Brock is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.