Australia put three unanswered goals past Oman Tuesday. Brett Holman, Josh Kennedy and Mile Jedinak were all on the scoresheet as Australia totted up their third win out of three and looked certain to reach the final qualifying round from Group D.
"The target was to win and to win well," said captain Lucas Neill. "Now we've got one foot in the next round but we've still got a lot of work to do."
Asia's best teams are all in action on Tuesday with South Korea hosting UAE and China playing Iraq among 10 fixtures around the region.
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In Tehran, security was tightened at Iran's Azadi Stadium following tensions with Gulf neighbours Bahrain, their rivals for the leadership of Group E and opponents later.
Jordan will look set to extend their stay at the top of Group A when they take on bottom-placed Singapore on the artificial pitch of Jalan Besar Stadium, while Indonesia play Qatar in Jakarta.
Thailand can cement second spot behind Australia when they host Saudi Arabia, while in Group B, Lebanon and Kuwait also look set to be scrapping for the second qualifying berth behind South Korea.
The winners and runners-up of the five groups will be drawn into two pools for the round-robin fourth stage, with the eventual top two in each section earning a ticket to Brazil.
The two third-placed teams will then face each other for the right to contest an intercontinental play-off.