Greece’s Stefanos Tsitsipas said he has no answers to his ongoing fitness problems after being forced to retire from his Wimbledon first-round match on Monday due to a back injury.
Former world number three Tsitsipas, seeded 24th this year, was trailing 6-3 6-2 to French qualifier Valentin Royer when he decided enough was enough.
The twice Grand Slam runner-up cut a disconsolate figure as he spoke to reporters.
“I’m battling
