Australian Samantha Stosur defeated tournament-favorite Serena Williams in straight sets on Sunday, pulling off one of the biggest upsets in U.S. Open history.

The ninth-seeded Stosur needed just 73 minutes to beat Williams 6-2 6-3, becoming Australia's first woman to win a Grand Slam title in more than 30 years.

The match was marked not only by Stosur's stellar play, but also by Williams' antics. In the second set, the three-time champion unleashed a tirade of insults at the umpire after being penalized for shouting “Come on!” after hitting what she thought was a game-winning shot.

The umpire determined that Williams had committed “verbal hindrance,” intentionally interfering with Stosur. Williams proceeded to shout at the umpire, calling her a “hater” and “unattractive inside.”

In 2009, Serena Williams was handed a fine of $82,500 and a suspension for the expletive-laden verbal abuse of a lineswoman during a semi-final match with Kim Clijsters.

Officials are expected to announce today whether Williams will face any further disciplinary action for her latest tantrum.

Williams, who was going for her fourteenth major victory, had missed last year's tournament, due to an injury that kept her sidelined for much of 2010.

In men's action, top-seeded Novak Djokovic will meet defending U.S. Open champion Rafael Nadal on Monday in the final match.