Co-hosts Australia have to beat Canada on Monday or risk an unthinkable exit from the Women's World Cup in the first round, while former champions Japan take on Spain with top spot in their group on the line.
Australia are sweating on the fitness of star forward and captain Sam Kerr for the Group B game against Canada in Melbourne which starts at 1000 GMT and where only a win will guarantee them a place in the last 16.
Kerr has missed the Matildas' two matches so far, in which they beat the Republic of Ireland 1-0 but then suffered a surprise 3-2 defeat against Nigeria.
She has declared herself available after a calf injury but it is uncertain how much of a part she will play against the Olympic champions. "Everyone involved in sport knows that with calf injuries it's one thing that you're available, but there's also risk when you come back from a muscle injury," said Australia coach Tony Gustavsson ahead of the game.