John McEnroe thinks there are two things that can make Novak Djokovic walk away from pro tennis and that's either reaching the point where he can't win a Grand Slam anymore or getting to No. 25 Majors and literally breaking every record possible.

Rising tennis star Jannik Sinner has acknowledged the influence of Novak Djokovic on his playing style, echoing John McEnroe's observations. After cruising into the third round of Wimbledon with a commanding victory over Aleksandar Vukic, Sinner drew comparisons to the 24-time Grand Slam champion Djokovic.