Boris Becker worked with Djokovic successfully for a while and the German has always spoken highly of the Serbian. He has regularly picked him as the one he thinks is the best of all time while also defending him during some of his controversial times. He also sided with Djokovic during the Australian Open fiasco despite believing Novak should get vaccinated.
On that he elaborated:
“On this occasion I think he is making a big mistake in not getting vaccinated. It is one that threatens what remains of his career and his chance to cement himself as the greatest player of all time. Four times I sat in his box as he won the Australian Open, so I am fully aware of his great strengths as an incredible competitor. I also think he has a great character that can easily be misunderstood."
Becker further said:
"Yet these strengths can also be weaknesses. The same incredible determination which I saw win so many close matches can be a vulnerability with his stubbornness. He is incredibly strong-willed, with very firm beliefs. If he does not, then in 10 years he will look back on it and realise he made a mistake."
Becker belivees not getting vaccinated will hinder him outside of Australia as well:
“It is not just about Australia. The fact is that we are living in a different world and he is going to find it very hard to live the life of a professional tennis player travelling around without the vaccination. Those are the rules, whether one likes them or not, and you have to accept it. Maybe one day we will get back to a more normal situation, but at 34 he does not have much time left to pursue his goals."