Recently which tennis legend announced his retirement at the age of 38 years? (A) Novak Djokovic (B) Rafael Nadal (C) Roger Federer (D) Andy Murryâ–ºCorrect Option Correct Option is: BRafael Nadal retires as the 2nd most successful men’s singles player of all time, behind only long time rival Novak Djokovic. Nadal won 22 Grand Slam titles.