Defending champion Novak Djokovic has progressed to the third round after defeating Japanese wildcard Tatsuma Ito in Melbourne.
The Serb, who won 6-1, 6-4, 6-2 in one hour and 35 minutes, will now face Yoshihito Nishioka, who had crushed British number one Dan Evans in straight sets.
Sixth seed Stefanos Tsitsipas also reached the third round after opponent Philipp Kohlschreiber withdrew injured.
He will face Canadian Milos Raonic or Cristian Garin of Chile in the third round.


Coventry promoted to Premier League after 25-year absence
Alcaraz pulls out of Madrid Open for second straight year
Injured Djokovic to miss Madrid Open
Mumbai's IPL campaign fizzles amid Bumrah's barren run
Iran women football players thank Australian government for protection
