Novak Djokovic is one of the greatest tennis players of all time. With 86 ATP singles titles, 37 Masters events and 20 Grand Slam's, few tennis players have achieved what Djokovic has. Currently ranked world number one and a record total of 365 weeks on top, Djokovic has dominated the sport for the last 10 years. Things have not always been easy for the world number one. Born in war-torn Belgrade, Serbia, Djokovic.