Prior to that, he announced his withdrawal from Tokyo 2020 and said he was planning to return to the tour later in summer, though it appears his plan has been derailed with his decision to skip Toronto and Cincinnati.
At the time, the world No 9 wrote: “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.”
Later in the post, he added: “I have already begun my rehabilitation in the hopes of returning to the tour later this summer.”
Federer, who turned 40 on Sunday (August 8) isn’t the only top player in doubt ahead of the US Open.
