Former Australian tennis star Casey Dellacqua says there is probably a reason why Roger Federer used the word "graduating" in his retirement letter to Rafael Nadal because one chapter is closed and the next one completely new is set to start.

Rafael Nadal and Roger Federer are considered two of the greatest players in the history of tennis, but they won't be grabbing a coffee anytime soon.

Roger Federer's former coach Paul Annacone claimed that sports has never had a greater competitor than the retired Rafael Nadal.