The 1988 Olympic champion and tournament favorite scored both goals in a lethal one-minute spell midway through the second half of Sunday's match to kill off Argentina's hopes in its first World Cup final since 1976.
Michelle Andrews scored in the 53rd minute from a penalty stroke, which just managed to crawl over the line.
A minute later, Australia's most prolific goalscorer, Jackie Pereira, collected the ball for a strong run into the circle, and slammed into the net for her first goal of the tournament and her 96th international goal to confirm the World Cup was heading down under.
"I just felt like it was justice today," said Australian coach Ric Charlesworth, who described his team's performance as "persistent and relentless."
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