French player Paul-Henri Mathieu returns the ball against Switzerland's Roger Federer during the 3rd round competition of men's singles at the French Open tennis tournament at Roland Garros in Paris, France, May 30, 2009. Federer won the match 4-6, 6-1, 6-4, 6-4

Serena added more spice after her ill-tempered win by calling her Spaniard opponent a "cheat". Their first set featured an incident in which Martinez broke serve to lead 3-2 after a shot appeared to rebound off her arm. The Spaniard won the point and then the set.

"The ball did touch her 100 percent on her arm," Williams said. "The rules of tennis are when the ball hits your body, then it's out of play. The ball hit her body, and therefore, she should have lost the point instead of cheating."

But Martinez refused to accept the label. "I put the racquet up," the 43rd-ranked Spaniard said. "The ball was in and it was a point for me. It didn't hit me or my body. To say I'm a cheat is stupid. I'm not going to comment on it."

Roddick, the only American man left at the tournament, made it into the round of 16 in Paris for the first time in his career by beating Marc Gicquel of France 6-1, 6-4, 6-4.

The sixth seed, who had never made an impression on the red dirt, has been in superb touch and will next play French 11th seed Gael Monfils, who beat Austrian Jurgen Melzer 6-2, 4-6, 6-3, 6-1.

Also in women's event, Jelena Jankovic of Serbia and Svetlana Kuznetsova of Russia both eased through in straight sets, beating Jarmila Groth of Australia and Melina Czink of Hungary respectively.

【体坛英语资讯：Djokovic and Dementieva stunned, Federer and Serena fight through】相关文章：

★ 体坛英语资讯：Seattle guard Durant named Rookie of the Year

★ 体坛英语资讯：Doctor: Yao Ming recovers well after foot surgery

★ 体坛英语资讯：Beijing Olympic flame reaches India

★ 体坛英语资讯：Nalbandian tames Nadal again in Paris final

★ 体坛英语资讯：Henin, Sharapova on course, Davydenko falls

★ 体坛英语资讯：Chinas new and old set early pace at worlds

★ 体坛英语资讯：Olympic torch relay starts in Nagano

★ 体坛英语资讯：Draft law seeks to find life after sport

★ 体坛英语资讯：US rely on home advantage against Russia

★ 娱乐英语资讯：Tom Cruise scared to star with Smith