Stanislas Wawrinka to miss US Open to undergo knee surgery

Stan Wawrinka of Switzerland returns a shot to Donald Young of the US during their 2015 US Open Men's Singles round 4 match at the USTA Billie Jean King National Tennis Center September 7, 2015 in New York.
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Three-time Grand Slam winner Stanislas Wawrinka will miss the rest of 2017 after deciding to undergo knee surgery.

Stanislas Wawrinka has announced that he will undergo knee surgery, a decision which brings to an end his 2017 campaign.

The three-time Grand Slam winner had been hoping to defend his US Open title at the end of the American swing, but the Swiss has instead opted to call time on his season after being advised to undergo a "medical intervention" on his knee, which troubled him at Wimbledon.

On Facebook, the 32-year-old said: "I am sad to announce that after talking with my team and doctor I had to make a difficult decision to undergo a medical intervention on my knee. This was the only solution to make sure I will be able to compete at the top level for many more years.

"This is obviously extremely disappointing, but I'm already looking ahead and planning my recovery. I love this sport and I will work hard to get back to my top level and play many more years. I also want to take this opportunity to thank my fans for sending plenty of messages of support during the last couple of days."

Wawrinka - who currently sits at world number four - had registered some mixed results during the first half of the season, but an excellent run at the French Open ended when he was defeated by Rafael Nadal in the final.

With 3,000 points to defend until the end of the year, Wawrinka is expected to rejoin the ATP Tour outside of the top 10.

Andy Murray of Great Britain celebrates victory during the Men's Singles first round match against Liam Broady of Great Britain on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 28, 2016 in Londo
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ATP RankingsPoints
1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060