Though we have 3 great players in the current generation (Andy Murray is very consistent and is always a contender at the major tournaments, but I do not think he is solidly in the Federer/Nadal/Djokovic conversation), there has been a distinct set of domination phases during the 2004-2015 time period, as highlighted below.

 

Federer Phase (2004-2007, 4 years)

Grand Slams == 11 (68.75%)

ATP 1000 Titles == 13

ATP World Tour Final Titles == 3

Ranking == No:1 for 3 full years (2005-07) and majority of 2004

 

Rafael Nadal Phase (2008-2010, 3 years)

Grand Slams == 6 (50%)

ATP 1000 Titles = 9

ATP World Tour Final Titles == 0

Ranking == No:1 for 1.5 years (Out of 3 years)

 

Novak Djokovic Phase (2011-2015, 5 years)

Grand Slams == 9 (45%)

ATP 1000 Titles = 21

ATP World Tour Final Titles == 4

Ranking == No:1 for 3.5 years (Out of 5 years)

 

Adios!