Stan Wawrinka will not defend his US Open title at Flushing Meadows and has been ruled out for the rest of the season after requiring a knee operation.
The 32-year-old three-time Grand Slam champion was troubled by a left knee problem during a first-round loss to Daniil Medvedev at Wimbledon and pulled out of the upcoming Masters 1000 events in Montreal and Cincinnati - to be shown live on Sky Sports - earlier this week.
Swiss star Wawrinka has since made the decision to take direct action in a bid to cure the problem by going under the knife.
He said in a statement released through his management: "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."
We will have the Masters 1000 series in Montreal and Cincinnati covered via our website skysports.com/tennis and you will also be able to watch all the action live on Sky Sports.
On the move? Head to our app for mobile devices and iPad, or follow our Twitter account @SkySportsTennis to join in the conversation. Who will win the US Open titles this year? Have your say...