Roger Federer set for another knee surgery, to miss US Open

Roger Federer

Roger Federer said on Sunday he will undergo further knee surgery and admitted he will be out for many months, a decision which casts further doubt on his future in tennis at the age of 40.

"I will be on crutches for many weeks and out of the game for many months," 20-time Grand Slam title winner Federer said in a video posted on Instagram.

The decision immediately rules him out of the US Open, where he has been champion five times and which starts in two weeks' time.

"I want to give myself a glimmer of hope to return to the tour in some shape or form," added Federer.

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