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.

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