Samantha Stosur never stopped believing she could join the ranks of Australian tennis greats with a Grand Slam singles title, but even she didn't expect it to be so easy against the most dominant player of her generation.

Big win: Samantha Stosur celebrates with the US Open trophy after
defeating Serena Williams 6-2, 6-3 in New York. Pic/AFP

Stosur displayed power and poise as she swept aside 13-time Grand Slam champion Serena Williams on Sunday, shrugging off an angry outburst from the American in the second set to put her name alongside such legends as Margaret Court and Evonne Goolagong.

"I didn't think that I'd be able to do it in 6-2, 6-3, that's for sure," Stosur said. Even after she'd surged through the first set -- winning the last 12 points -- Stosur thought she'd have a long afternoon ahead.

"After that first set I kind of sat down and I could feel my heart pounding out of my chest, and I thought, 'OK, I'm up a set now. I've got a chance to win one out of the next two and I've got a chance.'"

In the end, however, she completely out-played Williams, breaking her three times in the second set and surrendering her serve just once. Most impressively, she kept her composure as Williams lost hers, incensed by the chair umpire's decision to dock her a point when she called out "c'mon" mid-rally after a forehand she thought was a winner.

Through it all, Stosur said, "I just tried to keep playing each game, each point, and stick to my game plan, stick to my guns, and not leave anything to chance."