Switzerland's Roger Federer said on Tuesday that he had picked up a knee injury during the grasscourt season.
Federer, who turns 40 next month, had two knee surgeries in 2020 which resulted in more than a year of rehabilitation.
Roger Federer of Switzerland looks on as he sits down during a change of ends in his Men's Singles First Round match against Adrian Mannarino of France during Day Two of The Championships - Wimbledon 2021 at All England Lawn Tennis and Croquet Club on June 29, 2021 in London, England.
"During the grass court season, I unfortunately experienced a setback with my knee, and have accepted that I must withdraw from the Tokyo Olympic Games," Federer said on Twitter.
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