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Williams, seeded three, grabbed the first break in game six and powered on to a 6-4 6-3 victory.

The former world number one again went through the warm-up wearing knee-length boots before revealing a pair of hotpants and a studded crop-top.

She will face 16-year-old Tatiana Golovin of France in the last 32.

"These two matches I have felt like I have nothing to lose and I am really calm," said Williams.

I consider myself an entertainer, not just a normal athlete Serena Williams Quotes of the day

"I wasn't going for too much out there, I was just doing what I needed to do to go through."

In Wednesday's night match, Jennifer Capriati thrashed Spain's Magui Serna 6-0 6-2 in just 52 minutes.

Earlier, second seed Amelie Mauresmo made a shaky start against Julia Vakulenko of the Ukraine, but fought back to win 3-6 6-2 6-2 and set up a clash with Maria Vento-Kabchi.

"That was a pretty bad first set, I had no rhythm," said Mauresmo.

"It's satisfying to win but I'll have to be moving a lot better than I did today in the next round."

Russia's sixth seed Elena Dementieva continues to struggle with double faults, serving another eight to add to 11 from the first round as she beat S�verine Beltrame 6-3 6-2.

Daniela Hantuchova showed signs of regaining her best form with an impressive win over Olympic bronze medallist Alicia Molik.

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The Slovakian has suffered a major slump in the last two years, but came through 6-4 6-3 gainst the 17th seed.

"It was much easier for me," said Hantuchova. "The pressure was on her, nobody expected me to win. I was the one with nothing to lose."

Hantuchova plays number 15 seed Patty Schnyder in the third round.

Twelfth seed Ai Sugiyama was erratic on her way to a 6-2 6-4 win over Argentina's Gisela Dulko, while Schnyder swept past Iveta Benesova 6-4 6-1.

Vera Zvonareva, seeded 10th, beat Els Callens of Belgium 6-3 6-3.