In a high-quality match, fifth seed Jo-Wilfried Tsonga took more than three hours to beat Croatian Ivan Ljubicic 6-7(4), 7-6(8), 7-6 (7), 6-2 in the second round.

"I played really well out there. I was proud of myself because I was very courageous today," said the Frenchman.

French No. 12 seed Gael Monfils and No. 24 seed Richard Gasquet also joined countrymen Simon and Tsonga as second-round winners. Briton Andy Murray and American James Blake came through too.

In women's play, sixth seed Venus Williams crashed out, losing to Spain's Carla Suarez Navarro 2-6, 6-3, 7-5 in the upset of the tournament so far.

The loss to the world number 46 continued the seven-time Grand Slam champion's jinx at the season-opening Grand Slam, which she has failed to win in 10 attempts.

Three-time champion Serena Williams tamed Argentine Gisela Dulco 6-3, 7-5 but she had to recover after Dulco took a 5-2 lead in the second set.

Serena Williams of the United States returns the ball during the second round match of women's singles against Gisela Dulko of Argentina at the Australian Open tennis tournament in Melbourne, Jan. 22, 2009. Serena Williams won 2-0 (6-3, 7-5).

"Today I was at like a D minus at best," she said. "But it's good that I was able to win when I wasn't playing my best. I definitely will try to do better." "She had some opportunities but I never felt like I was going to lose."

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