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.
DR Congo score extra-time winner to qualify for World Cup
The Democratic Republic of Congo has qualified for the World Cup for the first time since 1974 after Axel Tuanzebe netted an extra-time winner to see off Jamaica 1-0 in their inter-confederation playoff on Tuesday.
Brazil score twice late on to beat Croatia 3-1 in World Cup tune-up
Brazil has beaten Croatia 3-1 in a World Cup warm-up in Orlando on Tuesday, with Igor Thiago converting a late penalty and Gabriel Martinelli adding a stoppage-time goal to seal the win.
Italy, Denmark miss out on World Cup after shootout defeats
Italy failed to qualify for a third consecutive World Cup after losing in a penalty shoutout against Bosnia-Herzegovina in their playoff final, while Denmark suffered the same fate against the Czech Republic.
Tiger Woods pleads not guilty, will seek treatment
Tiger Woods, on Tesday, released his first public statement since his rollover crash on Friday, announcing he would step away from golf to seek treatment in hopes of "lasting recovery".
FIFA president says 'only' Plan A for Iran's World Cup schedule
FIFA expects Iran to be a participant in this summer's World Cup, even as the country's request to move to change its group stage games appears to have been denied.
