7 Novak Djokovic records which may never be broken

Fastest to qualify for season-ending ATP finals tournament

Djokovic doing his 'typical' post-match celebration

After having won his first Grand Slam Down Under in 2008 at the age of 20, Djokovic went through a rather dry spell for the next two and a half years. Djokovic made extensive changes to his diet and training regimen going into the 2011 tennis season and enjoyed arguably the most productive season in the Open Era.

He qualified to participate in the ATP Finals in a record time of just under 19 weeks.