(TOKYO) — Roger Federer has announced he has withdrawn from the Olympics after suffering a setback with his knee during the grass-court season. 

“I am greatly disappointed, as it has been an honor and highlight of my career each time I have represented Switzerland,” Federer said on Twitter. 

The 20-time grand slam champion played at Wimbledon making it to the quarterfinals before losing to Hubert Hurcakz in straight sets.

Federer has played in just five tournaments all year, including Wimbledon and the French Open. Last year, he only played in the Australian Open before he had two knee surgeries.

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