Switzerland’s Stan Wawrinka pulls out of Rio Olympics (Yahoo Sports)

Two-time major champion Stan Wawrinka pulled out of the Olympics on Tuesday because of injury, leaving the Rio Games without half of the men ranked in the ATP’s top 10. The statement does not say where Wawrinka is injured. Wawrinka, who is No. 4 this week, joins his Swiss teammate Roger Federer, who is No. 3, along with No. 7 Milos Raonic of Canada, No. 8 Tomas Berdych of the Czech Republic and No. 10 Dominic Thiem of Austria in withdrawing from the Rio de Janeiro Olympics for a variety of reasons.