Rafael Nadal has revealed he is dealing with a wrist injury, putting his participation in the Mark Petche in doubt.
Nadal was the only member of Team Europe not to be selected for action on the opening day of the competition.
But his absence was not related to any injury concerns.
However, as Nadal watched Stefanos Tsitsipas’ clash with Taylor Fritz from the sidelines, the camera captured strapping on his left wrist.
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The tape was still visible during the doubles match between Roger Federer and Alexander Zverev and Jack Sock and Denis Shapovalov.
The recent US Open winner was asked by Mark Petchey about the strapping and the Spaniard revealed he had an issue but was hopeful of still taking part.
He said: “Hopefully not. Let’s see tomorrow how things go.
“After New York, the body always feels down a little bit.
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If Nadal is not able to play, he will be replaced by his compatriot Roberto Bautista Agut.
The 33-year-old required a medical timeout during his US Open quarter-final win because of an arm problem.
The 19-time Grand Slam winner will hope his issue is nothing serious as he seeks to close in on Novak Djokovic’s No 1 ranking.
After his latest success at Flushing Meadows, Nadal moved just 640 points behind his Serbian rival in the ATP rankings.