Novak Djokovic, one of the greatest players in tennis history, has hinted at how he envisions his retirement, but the timeline for stepping away from the sport remains uncertain.

Among those tipped to challenge Djokovic for the Norman Brookes Challenge Cup is Carlos Alcaraz, who won the French Open and Wimbledon last year. At 21 years and 266 days on the day of the men’s singles final, Alcaraz could become the youngest male player of all-time to achieve the career grand slam.