In an interview to the New York Times, Novak Djokovic's coach Marian Vajda recalled the time when this year in March Novak Djokovic called him after the Miami Open opening round loss to Benoit Paire to get back in his team and start a new second successful co-operation again. 'It was amazing.

I couldn't believe it', admitted Vajda. At the end of 2017, some seven months after splitting with Djokovic, he refused an offer to become Slovakia's Davis Cup captain. 'I had the feeling that I am still empty and I have no energy to start really working.

I didn’t feel it somehow that I really have to go back to tennis, so I was still postponing, postponing, postponing', Vajda revealed. Kevin Anderson's coach Braid Stine believes Vajda's return was the key for Novak: 'I don’t think there’s any doubt to what the key is.

The key to everything has been Novak bringing back his old team, including Marian. I’ve known Marian a long time, and he’s always been the stable factor. Novak’s been a guy who historically over the course of his career has brought in a lot of quote-unquote specialists to work on different aspects of his game, but Marian’s always been the guy there day in and day out.' ALSO READ: Rafael Nadal: Worse players than David Ferrer won a Grand Slam title