In a recent interview, Roger Federer was asked who between Rafael Nadal, who holds 17 Grand Slam titles, and Novak Djokovic, who holds 15, have better chances to reach his 20 Grand Slam titles record. The Swiss said: "It's all a question of how healthy they are gonna be, you have to pick the guy who is right behind you and Rafa is that guy", admitted Federer.
"We know what he could do on clay and we know when he is on and he is healthy, he can also go on and dominate. I think that both equally gonna have more time. The question is how long can they stay motivated, how long can they play and how much do they care about that record, wanting to break it.
If they do not care, they could retire maybe in the next one or two years. If they care about it, they might be playing for years to come and I hope for the game of tennis that they are gonna stick around for a long period of time."
Federer is motivated to make progress and improvements despite he is 37 years old: "I think you gotta keep training and make sure you improve certain aspects of your game. I have really been working hard to improve my game looking forward and volleying and that's been working very well.
I have a great team and a wonderful family around, so I try to stay on tour as long as possible but I need success to feel my motivation and at the moment it's all working very well."