FEDERER HAS 54 ATP titles.
NOVAK DJOKOVIC ALSO IS FINISHING THE YEAR AS #1 oh the ATP WORLD TOUR RANKINGS.
The Serb showed this 2019 of what he is capable of, by earning 5 titles and an epic win over Roger Federer pulling out A FEW Match pointS on Wimbledon’s final.  He has a Foundation to help children. 
https://novakdjokovicfoundation.org/
What makes Novak Unique?. His ability to stretch for balls is amazing not to mention the level of awareness and concentration that he can have on the tennis court. It’s seems for some players if they are not on a very very good day they have no chance to beat him at all.
How many more years of Novak at #1 spot ?.  Tennis as a mental sport is the master of all sports. Why?. Tell me some other sport that does not have a salary if you are not in the top 100-200 in the world. And to get there you already had to invest a lot of money.