It's a dream come true for the 19-year-old, who started to play tennis because of the legend. Djokovic was already at the top when Mensik made his first tennis steps, and the Serb is still among the world's best players many years later, extending his incredible legacy and cementing the GOAT status.

A letter from the PTPA to the ITIA is the first of a series of maneuvers that could redraw the contract between players and their sport.

Former world number one Novak Djokovic, the last surviving member of tennis' "Big Four", said he does not plan on stopping any time soon but admitted that the retirement of rivals Roger Federer, Andy Murray and Rafa Nadal has been overwhelming.

Novak Djokovic's bid for a landmark 100th ATP title remains on track in Shanghai, where news of Rafael Nadal's retirement plan has been a shock to the system.

Djokovic reached the semi-finals of the Shanghai Masters a day after Nadal announced this year would be his last on court.