PARIS - Novak Ðokovic extended his perfect start to the season at the French open on Saturday against Juan Martin del Potro 6-3, 3-6, 6-3, 6-2 for his 40th straight victory this year.

Djokovic has play Cup final in 42 of the last year's Davis lost. He and del Potro again Court Suzanne Lenglen was suspended on Saturday after splitting the first two sets Friday before the game because of darkness.

Novak Ðokovic is shy of Guillermo Vilas record (46) four wins 1977. (Getty Images) The second-seeded Serbian had no problems on the day 2 against del Potro, the 2009 US Open champion. He had 41 winners del Potro 22 and four of his five breaks in the last two sentences.

Rafael Nadal appeared also his fights behind him ahead in the fourth round with a 6-1, 6-3, 6-0-set victory over Croatian qualifier Antonio Veic. Australian Open finalist Andy Murray and Li Na also advanced.

Maria Sharapova has the fourth round, beating Taiwan's Chan Yung-Jan 6-2, 6-3 reached.

The seventh-seeded Sharapova overwhelmed their opponents on the Center Court Saturday and was never threatened.

Sharapova has won three major titles, but still needed a Championship at Roland Garros, complete a career Grand Slam.

Djokovic's 40-0 start by 2011 is the second-best opening streak in the open era, which began in 1968. The two-time Grand Slam champion overall winning streak of 42 only the record specified Guillermo Vilas in 1977 46 routes.

Djokovic appeared to beat Nadal in two clay court final, what a candidate for his first French Open title in the French Open. The Serbian takes the No. 1 ranking if he makes the final.

"Today is he much better done as I and he took his opportunities and the game made very difficult," said del Potro. "I had my chance in the third sentence-it miss all, two breakpoints, and I." "Against this player if you take your chance to not lose you."

Richard Gasquet of France, which Friday advanced with a 6-2, 6-3, 3-6, 6-3 victory over Thomaz Bellucci of Brazil is confronted in the next round, Djokovic no. 13.

Nadal, who had to win the five sets in his opening match at Roland Garros, had nine times to sell only 18 unforced errors and his opponents.

He five times French Open champion was his debut at Roland Garros dominant in 2005, when he won the first of four straight titles. His only defeat on the clay court Grand Slam came in the year 2009, when he was in the fourth round by one a 41-1 record in the tournament by Robin Soderling defeated him.

But Nadal started slowly this year five sets against John Isner need. In the second round Nadal saw 7-5, 6-3, 7-6 (4) shaky in defeating Pablo Andujar.

"I have a few things much better than the last few days." Happy for this, "Nadal said." "Only the beginning of the second, for moments of the second set, I had a few more mistakes." "But for the rest of the game, I think that I started, better to have control of the ball."

Murray moved to the next round despite his right ankle in the second set against Michael Berrer twist. The fourth-seeded Brit called for a trainer and had recorded his ankle before returning to the Court. He broke his German opponent to the next point and went to a 6-2, 6-3, 6-2-win.

"I rolled only my ankle, and then, of course, quite sore for the rest of the game," said Murray, adding that he would decide later if he can play in the next round. "I have just to wait and see, how it pulls up or to make sure enter the right things you think best shot after the next match to do."

Berrer said that he take advantage of the situation.

"It was a very great opportunity." I get maybe once in your life, think of a chance "said Berrer." "I should have hurt him if he fails, but it is difficult for me."

Murray would play Victor Troicki of Serbia, no. 21 Alexandr Dolgopolov of the Ukraine 6-4, 3-6, 6-3, 6-4 beating.

Also, no. 18 Gilles Simon eliminated: 10-seeded Mardy fish of the United States 6-3, 6-4, 6-2, and Juan Ignacio Chela of Argentina reached the fourth round of defeated Lukas Rosol of the Czech Republic 6-2, 6-4, 3-6, 7-6 (5).

The sixth-seeded Li, this year was the first Chinese player defeated until the final at a major tournament get Sorana Cîrstea, Romania, 6-2, 6-2 and will next play Petra Kvitová No. 9. Li has at least the quarterfinals in the other three grand slam tournaments, but it has progressed never, over in the fourth round of Roland Garros.

Trabzonspor defeated Vania King of the United States, 6-4, 6-2, while Ekaterina Makarowa, Russia eliminated No. 16 Kaia Kanepi of Estonia 6-4, 7-5, and no. 15 Andrea Petkovic Germany no. 24 Jarmila Gajdošová Australia 6-2, 4-6, 6-3, hit.

"I think I can improve, and I have improved from match to match, what is important," said Williams. "Probably, things could be better, but I have to work time and prepare for the next match."

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