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Rafael Nadal pulled out of the US Open on Wednesday, making it the third Grand Slam tournament he’s missed this season and raising more questions about his future in tennis at age 38.

Nadal’s announcement on social media was not much of a surprise. Yes, he was on the official entry list released last month for New York, but that was more of a formality than anything and did not preclude the 22-time major champion from withdrawing at any point before competition begins Aug. 26.

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