Novak Djokovic's retirement has been a hot topic over the past year, with the Serb's father, Srdjan, recently urging his son to start thinking about the end of his career

A former Wimbledon champion has claimed that Novak Djokovic will only retire on one condition. The 24-time Grand Slam champion suffered a disappointing defeat in the Miami Open final over the weekend. But Marion Bartoli believes Djokovic will keep playing until he hits one specific milestone.

Novak Djokovic continues to dominate men's tennis with remarkable records. With 24 Grand Slam titles and 40 Masters titles, he remains the only player to win each Masters at least twice. Djokovic has spent a record 428 weeks as world number one and holds an impressive eight year-end top rankings.