Rio 2016: Stan Wawrinka the latest tennis star to pull out of Games with injury leaving Switzerland team in crisis

STAN WAWRINKA has pulled out of Rio 2016 with a back injury.

The world No4 crocked himself in the Rogers Cup in Canada and is the fifth player ranked in the top ten to pull out of the Games.

Roger Federer, Tomas Berdych, Milos Raonic and Dominic Thiem have also withdrawn.

Swiss ace Wawrinka, 31, said: “I would like to have witnessed my third Olympic Games. This will not be possible now.”

Compatriot Federer, 34, who won silver in 2012 and is currently ranked No3, has pulled out with a knee KO.

Only Martina Hingis – who has not played at the Olympics since 1996 – and Timea Bacsinszky remain from the initial six-man team.

Raonic and Berdych both withdrew over fears of the Zika virus.

Golf stars Rory McIlroy and Jason Day have both also snubbed the Games in fear of the virus.