China will take on Uzbekistan in Group B action at 6 p.m., Beijing time. A win over the Uzbeks would supplant Team Dragon firmly in the knockout stage of the tournament.
And it's do-or-die for the Green Eagles of Saudi Arabia, who face a North Korean team also in desperate need of a win to stay in the cup.
South Korea became the first team to make it into the knockout stage after eking a 1-0 victory against Kuwait yesterday.
South Korea took the lead eight minutes before half-time, when veteran Cha Du-ri's cross found Nam Tae-hee in the middle, whose header went past 'keeper Hameed Youssef for the single goal of the game.
And hosts Australia joined South Korea after trouncing Oman 4-0.
The Socceroos were already up three going into the second half. Australia completed the rout in the 70th minute after Mathew Leckie crossed with a brilliant pass from the near side to set up a goal for substitute Tomi Juric, who knocked the ball in from close range.
