In an interview to the ATP YouTube Channel Roger Federer commented on why he keeps competing at 37 years old of age and after a 21-year career as a professional player. "I think it's simple, I just like playing tennis - could be mini tennis, could be playing tennis with my kids, could be practising here on site or in a big court, it doesn't matter.
I like playing tennis so when you have that feeling and that mindset everything else comes naturally and easy", said Federer. Rafael Nadal added: "I just enjoy the tour, I love what I am doing, I love tennis and just always like the competition.
I want to win every tournament that I play." Novak Djokovic finally concluded: "I am grateful that I am part of the era with these two guys. Ten years ago if you asked me that question I probably would have a different answer but over the course of the last ten years, I owe them to these two guys and the rivalries I had with them in terms of the improvement and evolution of my game. Rivalries that have forced in a way to really dig deep to understand what it takes to top one another."