Rafael Nadal, Novak Djokovic, and Roger Federer, collectively known as the Big Three, long dominated tennis, holding the world No. 1 spot for years and amassing a total of 66 Grand Slam titles.

While Federer and Nadal have battled injuries in the latter stages of their careers, often spending their final seasons sidelined, Djokovic's form has remained consistent. Although he didn't win a ...

Even with Djokovic's skill set, Nadal acknowledged that there were moments when Federer was just on another level. "For me, honestly, 2017, for a while, was the best level of his career.

He's the best player that I've ever seen." Andy Murray, Rafael Nadal, Roger Federer and Novak Djokovic pose for a photograph.© Clive Brunskill/Getty Images for Laver Cup ...