COMMERCE CITY, CO - SEPTEMBER 19: Alex Morgan #13 of the USA celebrates her goal in the 42nd minute against Australia with Carli Lloyd #10 of the USA and Lauren Cheney #12 of the USA at Dick's Sporting Goods Park on September 19, 2012 in Commerce City, Colorado. (Photo by Doug Pensinger/Getty Images)
Sundhage announced earlier this month she was stepping away after leading the squad to back-to-back Olympic gold medals. She will return home to coach the Swedish national team.
Heather O'Reilly, Shannon Boxx and Sydney Leroux also scored for the Americans, who move to 21-0-2 against Australia.
The Australians went ahead 2-1 late in the first half on Sarah Walsh's low shot past Hope Solo. A few minutes later, Morgan tied up the game.
Wambach deflected in the decisive goal in the 53rd minute when she simply stuck her foot out after Morgan unleashed a shot.
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