 The 21-time Grand Slam champion also assessed his performance in what was his 13th meeting with Medvedev, who has fast become one of his biggest rivals in recent years. Look, with Daniil its never easy, Djokovic said after beating the 26-year-old for the ninth time. You know, you always have to change pace, mix up ... Djokovic addresses injury concern as he admits Aus Open crossed... 