The battle between the World Cup co-host and the reigning European champion is the marquee clash of the semifinals.
Australia beat France in the longest penalty shootout in Women's World Cup history to set up the dream semifinal with England.
England is the best team on paper left in the competition, but it experienced some difficulties to reach the final four.
The Lionesses were taken to penalty kicks by Nigeria to start the knockout round and fell behind against Colombia in the quarterfinals.
England answered both challenges by winning on PKs and scoring within 10 minutes of Colombia's opener, but both of those results prove that the Euro 2022 winner is a bit vulnerable.
Australia's players will be super charged by the crowd in Sydney, and that could propel it to its first World Cup final.
Sam Kerr's presence on the field could elevate the atmosphere on Wednesday. The Chelsea forward came off the bench in the quarterfinals, but if she starts in the semifinal, it could give Australia the advantage it needs to beat England.
Kerr is one of the prolific scorers on the planet. She has 63 international goals in 123 appearances and scored over 10 goals in each of the last three seasons with Chelsea.
Most of the England squad carries knowledge of playing against Kerr in the Women's Super League, so it can try to neutralize her best attacking movements.
England has a star of its own in goal in Mary Earps, and it has a deeper attack, even without the suspended Lauren James, led by Alessia Russo, who scored six of her 13 international goals at the Euros and World Cup.
The match is a true toss-up if Kerr plays, but England has the better overall squad, and if Earps plays at her highest level in goal, Australia will have trouble beating her, even if Kerr is at her best.
Prediction: England 2, Australia 0
