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.
