Speaking to Punto de Break Rafael Nadal's coach Francis Roig spoke about the dominance of the Spaniard, Roger Federer and Novak Djokovic.
Roig is confident, Federer would have retired a long time ago, but his rivals keep pushing.
He said:
"The Big Three are pushing each other, that's for sure. If Rafa had stopped playing, Federer would have been retired for a long time.
“It's a battle to see who wins more Grand Slams but it goes much beyond. I was in Mallorca some time ago seeing him training after the wedding, before the ATP Finals. It's incredible that after 15 years the guy keeps being so strong, excited and interested.
“His game has changed, he is not that physical anymore, he enjoys playing, bringing new things, even on hard court tournaments. Now on the hardcourt, he wins more matches and he wins them in an easier way. Quicker, in two sets. Before, it was more complicated and now matches are played on his racket."