Novak Djokovic has jokingly hinted towards coaching Joao Fonseca once he has retired from professional tennis.

The 38-year-old continues to defy his age across the ATP Tour with the record 24-time Grand Slam champion still competing at the top of men's singles events.

Djokovic is through to the second round of this year's US Open thanks to a comfortable 6-1 7-6 [7-3] 6-2 victory against Learner Tien .

Should he go all the way, the Serbian will win a fifth title in New York and go level with Roger Federer, Pete Sampras and Jimmy Connors.

Whilst Djokovic is showing little sign of calling it quits, he dropped a hint over his retirement after losing to Jannik Sinner at the French Open.

But when he does decide to hang up his racket, he claimed he'd be keen to coach one of tennis' up

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