Federer withdraws from Toronto, Cincinnati Masters, doubtful for US Open
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Swiss ace Roger Federer has pulled out of the upcoming Toronto and Cincinnati Masters events due to a knee injury. He is yet to confirm his participation in the US Open, starting August 30. The 39-year-old had earlier withdrawn from the Tokyo Olympics after reaching the quarter-finals at Wimbledon. Federer, who will turn 40 on Sunday, underwent a double knee surgery last year.