Isner: No issues with ankle in return
Isner was unable to play in the United States' Davis Cup tie against Great Britain earlier this month because of the injury. The American No. 1 also missed part of the start of last season with a knee injury.
"I played for two hours and no issues [with the ankle],” Isner said. “I'm so happy about that. If I was walking off this court a loser I'd still be happy.''