France, May 23 -- "It's a shame," said the 21-year-old, who was seeded 17th and scheduled to play the 2015 champion Stan Wawrinka in the opening round.

"In Rome, I felt some discomfort in my hip, and I didn't want to take any risks," Fils added. "After I had some tests done, everything seemed fine but I was still in pain and couldn't train."

Fils, who was on the sidelines for eight months with a back issue after pulling out of his third-round match at last year's French Open, said: "It's definitely not the same injury, but I don't know exactly. I can't explain it, there's just pain. And it doesn't go away when I'm on the court.

"If this were the last tournament of my life, I would have played, but I hope to have another 10 or 15 years ...