Jo-Wilfried Tsonga retires with a groin injury against Mikhail Youzhny in his fourth round match at the French Open .
"In the last match, I had trouble with the glute muscle," he said. "Today, the first time I ran end of the first game, game point for him and he made a winning forehand, I hit and I felt a sharp pain."
Tsonga said he did not know exactly what the injury was. "I can't tell you exactly right now because tomorrow I will do some more tests."
His exit means there are no French players left in the tournament.