U.S. Open

Venus Williams returns a shot against 124th-ranked Bethanie Mattek-Sands, whom she beat, 6-4, 6-2. (Matthew Stockman, Getty Images / September 2, 2009)

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NEW YORK — - Serena Williams took only 53 minutes and committed only nine unforced errors in her 6-1, 6-1 second-round victory over 51st-ranked Melinda Czink of Hungary.

It was an emphatic win, and it prompted Serena to do a little happy dance when it was over. That was in contrast to earlier in the day, when Venus Williams played her second-round match with her left knee heavily taped.

That didn't stop third-seeded Venus from dispatching 124th-ranked Bethanie Mattek-Sands, 6-4, 6-2, and moving closer to an anticipated fourth-round encounter with 2005 Open champion Kim Clijsters.

Clijsters, who hasn't played here since she won the title in 2005 and who has been back on the circuit for only a month after ending a two-year retirement, upset 14th-seeded Marion Bartoli, 5-7, 6-1, 6-2.

While Williams declined to talk about her knee, Clijsters said she would be interested to see how that knee holds up. "I think what we don't know is how her knee is going to react after a couple of matches," Clijsters said.

Williams neither complained about pain nor explained why the knee hurts, except to say, "Wear and tear does put a lot on your body. It's September now. I started literally in December. So I guess it's not a huge surprise that at this time of the year things start to be a little sore and start to hurt."

The men's results continued mostly uneventful. Top-seeded Roger Federer, the five-time defending champion, beat 28-year-old Simon Greul of Germany, 6-3, 7-5, 7-5. He finished off the match with an ace. And Rafael Nadal got out of his first-round match so easily, it was hard to tell whether his sore knees were a problem. He beat Richard Gasquet of France, 6-2, 6-2, 6-3.

Stat of the day: In his 5-7, 6-2, 6-4, 6-0 loss to Robby Ginepri, Romania's Andrei Pavel won zero points off his second serve in the final set.

Upset of the day: Vania King, a 20-year-old from Long Beach, Calif., who is ranked 114th in the world and needed a wild card into the draw, knocked out 15th-seeded Samantha Stosur of Australia, 6-4, 7-5.