Novak Djokovic responds to the audience. File photo

After trying his hands on Sumo wrestling, the world number one Novak Djokovic is on a new mission.

The Serbian tennis star tweeted a video of him playing basketball with a caption "Am I ready for a 1:1 @KingJames?"  

LeBron James responded, “Ha! I’m going to say I think you are!! Beautiful follow-thru on that shot buddy!💪🏾🙏🏾”

The Serbian star was showing off some impressive moves on the court.

The world number one appeared to row back on scepticism over plans to stage the US Open, saying he was "extremely happy" the Grand Slam had escaped the coronavirus cull which claimed Wimbledon and much of the season.

Meanwhile, on a serious note, Croatia's Borna Coric announced he has tested positive for coronavirus after playing in an exhibition tournament in Croatia featuring Djokovic.

"Hi everyone, I wanted to inform you all that I tested positive for COVID-19," the top 50 player posted on Twitter.

On Sunday, another player, Grigor Dimitrov, said he had also tested positive after pulling out of the exhibition event.

Coric said: "I want to make sure anyone who has been in contact with me during the last few days gets tested!

"I am really sorry for any harm I might have caused! I'm feeling well and don't have any simptoms (sic). Please stay safe and healthy! Lots of love to all!"

Sunday's final between Djokovic and Russia's Andrey Rublev was immediately cancelled as a precaution.