Nadal is sporty towards his teammates and believes Djokovic should play at the Australian Open.
This is encouraging for tennis as a sport, given that tennis is usually considered to be an elegant sport.
Besides being a champion, Djokovic is a nice kind person as we could have seen during his matches.
I remember the moments when he kept the umbrella of the ball boy
or the moment when he gave his racket to a boy
So, yes...karma exists.