WATCH: Football superstar Cristiano Ronaldo and Novak Djokovic train together in Dubai

Novak Djokovic discomfort at US Open

Novak Djokovic has been getting some top end training this winter after hooking up with football superstar Cristiano Ronaldo in Dubai.

The unlikely duo trained together, with Ronaldo sharing a video which showed him and Djokovic doing jumping exercises – with Juventus star Ronaldo in particular famed for his leap.

“Teaching Novak Djokovic how to jump,” Ronaldo captioned the video. “Was a pleasure to see you and train with you my friend!!”

The remainder of Djokovic’s career is likely to be defined by whether or not he can surpass the Grand Slam title counts of Roger Federer and Rafael Nadal.

Federer currently leads the way with 20, with Nadal one behind on 19. Djokovic has 16, but appears to have more years left in him than his main rivals.

One man who fully expects both Djokovic and Nadal to break his current record, though, is Federer.

“It’s okay, they are truly incredible players,” Federer said.

“I mean, I cannot stop them. What [I can] do is only control what I can control.

“The No. 1 goal is to stay healthy, because if I stay healthy I can achieve things – and I’d like to achieve still a few things.”

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