(Updates with Djokovic's match, Nadal rain-out)

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World No. 1 Novak Djokovic trounced unheralded Argentine Guido Pella 6-2, 6-0, 6-2 in second-round action Thursday at the French Open, while the match of seven-time French Open champion Rafael Nadal was postponed due to rain.

Djokovic needed just an hour and 26 minutes to brush aside his 83rd-ranked opponent, whose only hope was to catch the Serbian on an off day.

That was not the case on Thursday, as the 2012 runner-up made precious few unforced errors and was unaffected by a rain delay that prolonged the inevitable.

"In the rallies, you feel like you're on equal footing, but he wins all the points," Pella said. "He's an athlete. He has outstanding physical gifts."

Next up for Djokovic in Saturday's third round will be Bulgaria's Grigor Dimitrov, who stunned the Serb in the second round of this year's Rome Masters.

But the story of the day was the rain, which interrupted nine matches and prevented 25 others from being completed, including a second-round contest between Nadal and Slovakia's Martin Klizan that was completely washed out.

The rainout pushed that match back to Friday, while the winner will have to play again on Saturday.

In women's action Thursday, American Bethanie Mattek-Sands rallied to upset China's Na Li, the sixth seed and 2011 French Open champion, 5-7, 6-3, 6-2.

The Williams sisters, meanwhile, withdrew Thursday from the French Open women's doubles due to a back injury suffered by Venus, the elder sibling.

Venus and Serena, who had been the heavy favorites to take the title despite being seeded No. 12, pulled out prior to their scheduled first-round match against Russian Alla Kudryavtseva and Australian Anastasia Rodionova. EFE