"I get a code violation for this? I express who I am. We're in America," Williams said later after the awarding ceremony in an on-court interview.

"I hit a winner, but I guess it didn't count," Williams said. "But it wouldn't have mattered in the end."

Talking about what she said to the umpire in the post match conference, Williams said: "I don't even remember what I said. It was just so intense out there. It's the final for me, and I was -- I guess I'll see it on YouTube. I was just in the zone. I think everyone, when they play, they kind of zone out kind of thing. I don't know."

Williams made a brief comeback after the controversy, breaking Stosur's serve in the next game and winning her next two service games to take a 3-2 lead. Stosur, who won the final 12 points of the first set, responded by winning the final four games of the match.

Stosur played 147 games in the first six rounds of the tournament compared with 103 for Williams, and was part of a women's Grand Slam record when she and Maria Kirilenko played a 17-15 tiebreaker, in which Stosur lost, in the fourth round,

Williams, who had not lost a set in the tournament before the final, was the pre-tournament favorite to win her 14th Grand Slam singles title.

The 29-year-old American was playing the US Open for the first time since 2009 and was coming back from two operations on her foot and blood clots in her lungs, returning to the courts in June after more than a year on the sidelines.

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