Stan Wawrinka will not defend his United States Open title and will sit out the rest of 2017 because of an injured knee.
In a statement through his agency, Wawrinka said Friday that a medical procedure “was the only solution to make sure I will be able to compete at the top level for many more years.”
He joins Novak Djokovic, the man he beat in last year’s final at Flushing Meadows, in calling it quits for this season because of an injury.
The fourth-ranked Wawrinka, a three-time Grand Slam champion, reached the final of the French Open in June, losing to Rafael Nadal, but was eliminated by Daniil Medvedev in the first round at Wimbledon.