Kei Nishikori, the 2014 US Open runner-up, withdrew from the year’s last Grand Slam tournament on Sunday after being sidelined all month with an injured left knee.
Nishikori was replaced in the men’s singles draw at Flushing Meadows by James Duckworth, who lost in qualifying. Duckworth will face Felipe Meligeni Alves on Tuesday in the first round of the US Open.
The tournament begins on Monday.
Nishikori is a 33-year-old from Japan who had an operation on his hip in January 2022. He returned to the ATP Tour in late July in Atlanta, where he won two matches to reach the quarterfinals before losing to Taylor Fritz.
Nishikori then missed an event in Washington, citing a problem with his left knee, and has not been back in action.
He was ranked as high as No. 4 in early 2015, about six months after his semifinal victory over Novak Djokovic at the US Open made him the first male Grand Slam singles finalist from Asia.
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