We're with the man who claimed victory at the Nitto ATP Finals in November last November, Daniil Medvedev, two of the very best coaches on the ATP Tour, Novak Djokovic's long-time mentor, Marian Vajda and the man working very closely with Dominic Thiem, Nicolas Massu and we also turn our attention to doubles and two of the very best in the business, Grand Slam winners Kevin Krawietz and Marcelo Melo.