Novak Djokovic is a 26-year-old tennis player who is currently the World Number 2 in ATP rankings for tennis players. This tall Serbian player has also previously remained the World Number 1 tennis player according to same rankings. His fans regard him as one of the greatest all-time players in the world. This is not surprising after giving a consideration to his six singles titles in Grand Slams. He is also the first Serbian player to have achieved this feat and to have remained as World Number 1 for more than 100 weeks.