World number one Novak Djokovic beaten American Frances Tiafoe in four sets in their Australian Open second round match in Melbourne.
Third seed Dominic Thiem has defeated Dominik Koepfer in straight sets.
Nick Kyrgios faces 29th seed Ugo Humbert.
Serena Williams is into the third round of the ladies singles after she saw off Nina Stojanovic in straight sets.
However, Petra Kvitova and Bianca Andreescu were knocked out.
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