Roger Federer is doubtful for the US Open after he pulled out of the tune-up events in Toronto and Cincinnati with a knee injury.
Federer, who made a comeback from two knee surgeries, was last seen at Wimbledon. After battling though the first week, the 39-year-old seemed to run out of gas against Hubert Hurkacz.
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The former Wimbledon champion went down 3-6, 6-7, 0-6 to the Polish youngster in the quarterfinals.
Federer has competed in five tournaments this year, recently missing the Tokyo Olympics due to injury.
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When he announced his withdrawal from the Olympics, Federer tweeted: “During the grass-court season, I unfortunately experienced a setback with my knee.”
The World No. 9 made his Grand Slam comeback at French Open, where he reached the fourth round before withdrawing.
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Federer has enjoyed success in Canada, winning two titles in Toronto, and is a record-holding seven-time champion in Cincinnati.
It was also announced Thursday that Tokyo Olympics singles gold medallist Alexander Zverev will not compete in Toronto.
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