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.

Roger Federer, Rafael Nadal and Andy Murray have all retired from tennis, and Novak Djokovic is the only member of the so-called “Big Four” still going” Yet the 37-year-old Serbian great says one person very close to him has been pressuring him to retire in the near future.