PARIS — Serena Williams looked ill, and not only because she had lost five games in a row at the French Open.

A trainer paid Williams a visit during a changeover, checked her temperature and gave her pills. Then came a third-set surge, and Williams beat 18-year-old Russian Anastasia Pavlyuchenkova on Saturday, 6-1, 1-6, 6-2.

There was no prescription to help Andy Roddick, who lost to Russian qualifier Teimuraz Gabashvili 6-4, 6-4, 6-2. Roddick threw rackets and argued with the umpire, but the fits of temper failed to produce a turnaround against an opponent ranked 114th.

The top-ranked Williams appeared in danger when she fell behind 5-love in the second set and summoned the trainer. Soon Williams' court movement improved, her strokes steadied and she advanced to the fourth round.

The seesaw win assured Williams of retaining the No. 1 ranking after the tournament.

In the completion of suspended matches, Russians Mikhail Youzhny and Nadia Petrova reached the fourth round.

Youzhny, seeded 11th, defeated Viktor Troicki 2-6, 7-6 (4), 6-2, 6-3. Petrova, seeded 19th, edged No. 15 Aravane Rezai of France, 6-7 (2), 6-4, 10-8.

Petrova plays Venus Williams next.

Top-seeded American twins Bob and Mike Bryan were upset in the second round of doubles by unseeded Brazilians Marcelo Melo and Bruno Soares, 6-3, 7-6 (6).

On a cloudy, windy, chilly day, Williams' aggressive returns had Pavlyuchenkova's serve under constant pressure early, but the talented young Russian suddenly reversed the momentum in the second set.

Williams began to look sluggish during points, took her time between them and occasionally grimaced, while Pavlyuchenkova's booming groundstrokes kept finding the corners.

But in the third set, Williams erased three break points to take the lead for good at 2-1. She again became forceful with her returns, and whacked the last one at Pavlyuchenkova's feet for the win.

Three sets were all the No. 6-seeded Roddick could manage. Playing on his worst surface, he found himself always on the defensive against Gabashvili, who even had the more dominating serve, with a 9-4 edge in aces. Roddick never broke and lost serve four times.

His mood was sour almost from the start. During a first-set changeover, Roddick threw two wrapped rackets and seemed to be angry about way they had been strung.