Boris Becker used to coach Novak Djokovic a few years ago and they remained on good terms with the Serbian supporting Becker through his hardships.
Djokovic has always maintained a positive relationship with Boris Becker as somebody whom he respects. Becker revealed that Djokovic was very supportive of him during his hardships. He spoke about the Serbian during a press conference for a new documentary film about himself in Berlin saying:
"Novak Djokovic became a family member. You know we had a professional relationship for many years and we parted ways in 2016. But we always stayed close and especially my time inside (prison) - while I was inside, Novak supported me, he supported my family. I started crying when he started winning."
Djokovic is on record explaining that he was saddened by what happened to Becker calling it a terrible situatio. He would know something about those becaue he had a few happen to him as well.