Hilarious video captures Novak Djokovic signing a fan's CHEST after defeating Holger Rune in dramatic three-hour clash in Turin

Footage has emerged of Novak Djokovic being asked a bizarre request at the ATP Finals in Turin on Sunday.

After his win against Holger Rune, the Serbian - who won the US Open back in September - went around the arena signing autographs and taking pictures.

One of the fans in attendance hilariously asked the tennis star to sign his chest.

While Djokovic has almost certainly rarely had that type of a request before, the 36-year-old happily obliged.

In a video uploaded to Nitto ATP Finals' official Instagram page, Djokovic can be seen signing the fan's torso with his initials.

After he inked the man's skin, Djokovic was seen giving him a friendly pat on the head.

It came after he defeated Rune 7-6 (4) 6-7 (1) 6-3 in a match that lasted three hours and eight minutes inside the Pala Alpitour arena in Turin.

During the first match at the ATP Tour Finals, Djokovic also went viral for another moment.

Frustrations boiled over for the Serbian at the start of the third set. He broke straight away to start the deciding set, but Rune went on to recover the deficit straight away.

Rune's recovery then promoted Djokovic to stamp on two rackets - before going on to break again to lead 4-2. 

Speaking after the encounter, Djokovic told Prime Video: 'It took everything. I saw in the first game when he fired shots from the baseline, I knew it was going to be a tough night for me. I thought he played great. I played great in some moments.

'Overall a win is a win. It was a very emotional win and a tough win knowing the significance of tonight's match. After a really terrible second-set tie-break I think I played a really solid third set.'

Following his latest victory, it now means that he has now win his last 19 matches and is guaranteed to finish the year as world No 1.

'It means a lot. You could see there were a lot of emotions on the court. I could feel it. I was very eager to win tonight's match, get that monkey off my back,' when speaking about ending the year at the top.

'I won Paris, which put me in a much better position rankings-wise, and I knew coming into Turin I only needed to win one match. A big goal is achieved, everything else now is a bonus.'

The Serbian has enjoyed a remarkable 2023 despite losing to Carlos Alcaraz at Wimbledon in the final. In June, he sealed a record 23rd Grand Slam title after seeing off Norway's Casper Ruud 7-6, 6-3, 7-5 in the French Open final.