World number 43 Alexei Popyrin believes he can "do some damage" when he plays Novak Djokovic in the Australian Open second round on Wednesday.
Ten-time champion Djokovic faces the Australian, 24, in the last match of the night session on Rod Laver Arena.
Before that, defending women's champion Aryna Sabalenka plays teenage qualifier Brenda Fruhvirtova.
Asked about the difficulties of facing top seed Djokovic, Popyrin said: "I don't think he's got any weaknesses."
He added: "He is the greatest of all time in our sport, so to get there you have to have no weaknesses.