NY, NY

Samantha Stosur shocked Serena Williams 6-2, 6-3 to win the U.S. Open Sunday in New York.

The 27-year-old Australian powerhouse captured her first-ever Grand Slam title, while Williams blew her cool and yelled at a chair umpire.

Serena conceded Stosur outperformed her throughout the match.

"I don't even remember what I said. It was just so intense out there. ... I guess I'll see it on YouTube ... I hit a winner, but I guess it didn't count," Williams said during the trophy presentation. "It wouldn't have mattered in the end. Sam played really well."

Stosur even surprised herself, telling the Daily News: "I'm still kind of speechless," Stosur said. "I can't actually believe I won this tournament."

Serena was inconsistent, committing 25 unforced errors to just 12 for Stosur, who used a strong forehand to keep Williams from winning her 14th major championship.

Williams will learn Monday if she will be fined for her outburst.

"Aren't you the one who screwed me over last time here? Do you have it out for me? That's totally not cool," she asked the chair umpire after a ruling went against her.

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