Fan asks year-end No. 1 Novak Djokovic to sign his chest after ATP Finals win

You've seen players sign autographs on giant tennis balls, small tennis balls, photos, and other collectibles—but on the first day of the ATP Finals in Turin, Novak Djokovic got what might've been a first: A fan asked him to autograph his chest.

Here's how it went down: Shortly after defeating Holger Rune in his opening round-robin match at the ATP Finals in Turin, clinching the year-end No. 1 ranking in the process, Djokovic made the usual rounds to adoring fans courtside. He was soon approached by a young, blonde-haired man, who shook Djokovic's hand to congratulate him on his efforts.

Then, the fan popped the question: "Novak, will you sign my chest?"

Djokovic happily obliged, after a brief debate as to where to actually sign, and sent the fan on his way with an enthusiastic pat on the head.

The interaction was a lighthearted ending to what was an emotional evening for Djokovic, who secured the tough, three-set victory after 1 a.m. local time in Turin. He admitted to feeling as much throughout the match.

"You could see there were a lot of emotions on the court. I could feel it," he said. "I was very eager to win tonight’s match, get that monkey off my back. 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."