The difference in popularity between tennis players is something they can hardly alter. Some players are simply like more than others and that is the case about the top 3. Roger Federer is the most popular tennis player of all time followed by Rafael Nadal and only then comes in Novak Djokovic who always envied the popularity those two had.
According to Boris Becker that results in unfair treatment for Djokovic compared to them and he believes that is not acceptable. He said:
"I know Novak privately and professionally, and I can only say that he is a fine guy. A competitor who sometimes misbehaves on the court, but who doesn't? The public, including the media, really have to get used to the fact that there are not just two, but three [legends], who have great qualities as players and as individuals. It is not acceptable that Novak is always the bad guy and Roger and Rafa are always the good guys - that is unfair."
Becker then went on to point out some of the great things Djokovic does regularly hoping the global perspective about him changes:
"I hope that these two weeks in New York, the final, the following speech and the reaction of the New York audience will ensure that he is finally seen in a different light.
"He publicly stood up for [Stefanos] Tsitsipas [in the toilet break row] after the semi-final against [Alexander] Zverev; he often stands up for other players. That's often swept under the rug and no one wants to perceive that in any way. There's another side to him, and it's very sympathetic. I hope for him and for his family that he's finally treated a little more fairly than he has been until now."