World number one Novak Djokovic defeated world number 19 Daniil Medvedev in Australian Open fourth round to reach the quarter-finals of the tournament for the 10th time. The six-time Australian Open champion won 6-4, 6-7(5-7), 6-2, 6-3 in three hours and 15 minutes. Djokovic returns to the last eight at Australian Open for the first time since 2016.