Croatian Marin Cilic, 10th seeded overcame Ricardo Mello from Brazil in 6-1, 3-6, 6- 3, 6-1.

In the women's singles event, second seed Venus Williams swept Swiss Patty Schnyder in straight sets. The American's younger sister is going to began her first round match on Monday as the top seed. Her opponent is Stefanie Voegele from Switzerland.

Chinese fledgling Zhang Shuai, who won three qualifying matches in a row to advance into the first round, could hardly make any threat against the 19-seeded Russian Nadia Petrova.

Zhang, 21, didn't won any game in the first set, then lost the second set in 6-3.

"She served so well," said Zhang. "But I still felt that I had some chances during the match. I was just too tired to play well."

Zhang's compatriot Li Na is slated to meet French Kristina Miadenovic in the Suzanne Lenglen court on Monday.

French top tennis player Jo-Wilfried Tsonga didn't let the home crowd down as he hold off German Daniel Brands's strong challenge at the opening day of French Open to win the first round in five sets on Sunday.

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