Federer joins the likes of Rafael Nadal, Dominic Thiem and Nick Kyrgios from the men's side, as well as Simona Halep, Serena Williams and Bianca Andreescu latterly the latest name on the Women's side to announce they will not travel to Japan.
All have a myriad of reasons but for Federer, it is due to a 'setback' with his knee which has caused him to pull out after his return to the tour at Roland Garros and Wimbledon.
2020 Olympic Games Tennis ATP Entry List with Djokovic, Tsitsipas and Murray (last update 18-07-2021)
"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," said Federer.
"I am greatly disappointed, as it has been an honor and highlight of my career each time I have represented Switzerland. I have already begun rehabilitation in the hopes of returning to the tour later this summer. I wish the entire Swiss team the best of luck and I will be rooting hard from afar."