Injured Stan Wawrinka withdraws from Olympics

Stan Wawrinka withdrew from the Olympics on Tuesday, with a statement from his management team citing an undisclosed injury.

Wawrinka lost in the semifinals of the Rogers Cup in Toronoto last week, and his withdraw means the Rio Games will now be without half of the world's Top 10 players.

"I'm very sad. I was really excited about playing in Rio," Wawrinka said in a statement. "After Beijing and London, I was very much looking forward to playing in my third Olympic Games. I wish all the Swiss athletes the best of luck throughout the coming weeks."

The fourth-ranked Wawrinka is a two-time major champion and is the second-highest ranked player in the world who will not be in Rio, joined by Swiss teammate Roger Federer (No. 3), No. 7 Milos Raonic of Canada, No. 8 Tomas Berdych of the Czech Republic and No. 10 Dominic Thiem of Austria.

Wawrinka made the decision after experiencing discomfort during the Rogers Cup.

"Stan Wawrinka felt increasing pain during the tournament in Toronto and therefore traveled back to Switzerland in order to consult with his doctor for a complete check-up," said the statement released by Wawrinka's management company.

"Following analyses and a MRI scan, local overstress was discovered and he was advised to reduce his physical activity for an undetermined period during which he will undergo further examinations."

Fifth-ranked Rafael Nadal, who has been recovering from a left wrist injury since the French Open, still may pull out of the Olympics depending on how his conditioning goes before play begins Saturday.