Roger Federer has serious doubts for the US Open after withdrawing from two previous events due to lingering injury concerns.
Federer’s retirement from upcoming hard court tournaments in Toronto and Cincinnati were announced Thursday, and officials cited persistent problems with his surgically repaired knee.
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The news follows the surprising decision of the 20-time Grand Slam champion to skip the Tokyo Olympics after he said he “experienced a setback” with his knee at Wimbledon.
Federer, who turns 40 on Sunday, has not competed since losing in the quarterfinals to Hubert Hurkacz at the All England Club.
The Swiss champion was humiliated in straight sets, losing the final set 6-0 to score his first Grand Slam bagel on grass.
The game begins in Toronto on Monday and in Cincinnati on August 16.
Hard court events traditionally serve as the two main adjustments before the US Open, the last grand slam of the year that is scheduled to begin in New York on August 30.
Federer is a seven-time champion in Cincinnati and has won two titles in Canada.
But their withdrawal from both has cast serious doubts on their participation in the US Open, leaving fans shattered.
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Other players whose retirements from Toronto were announced Thursday were Olympic gold medalist Alexander Zverev, Wimbledon runner-up Matteo Berrettini, Canadian Milos Raonic and Spain’s Pablo Carreño Busta.
Novak Djokovic retired last month before his first match at the Olympics.
Arthur Ashe Stadium was the scene of an epic run of five consecutive US Open titles for Federer from 2004 to 2008.