PARIS (AP) Rafael Nadal breezed into the fourth round at the French Open on Saturday, regaining his dominant form by dispatching Croatian qualifier Antonio Veic 6-1, 6-3, 6-0.

The five-time champion at Roland Garros needed five sets to win his opening match, and was then pushed to tiebreaker in the deciding third set of his next match. But against Veic, Nadal had only 18 unforced errors and managed to break his opponent nine times.

Andy Murray also moved into the next round despite an injury scare in the second set when he twisted his right ankle. He eventually beat Michael Berrer 6-2, 6-3, 6-2.

On the women's side, Australian Open finalist Li Na also reached the fourth round, defeating Sorana Cirstea of Romania 6-2, 6-2.

Later Saturday, Novak Djokovic and Juan Martin del Potro were to return to the court to continue their match from Friday that was suspended because of darkness after the pair split the first two sets. Three-time Grand Slam champion Maria Sharapova was also scheduled to be on court.

Nadal has been dominant at Roland Garros since his debut in 2005, when he won the first of four straight titles. His only loss at the clay-court Grand Slam came in 2009, when he was defeated by Robin Soderling in the fourth round.

But Nadal started off slowly this year, needing five sets to beat John Isner. In the second round, Nadal looked shaky in defeating Pablo Andujar 7-5, 6-3, 7-6 (4).

On Court Suzanne Lenglen, Murray was playing Berrer when he twisted his right ankle and dropped to the ground in pain.

The fourth-seeded Brit called for a trainer and had his ankle taped before returning to the court and breaking his German opponent on the next point.

Murray will next play Victor Troicki of Serbia, who beat No. 21 Alexandr Dolgopolov of Ukraine 6-4, 3-6, 6-3, 6-4.

The sixth-seeded Li, who this year became the first Chinese player to get to the final at a major tournament, will next face No. 9 Petra Kvitova. Li has made at least the quarterfinals at the other three Grand Slam tournaments, but she has never progressed past the fourth round at Roland Garros.

Kvitova defeated Vania King of the United States 6-4, 6-2, while fourth-seeded Victoria Azarenka of Belarus also advanced, beating No. 30 Roberta Vinci of Italy 6-3, 6-2.

I think I can improve, and I have been improving from match to match, which is important,'' Azarenka said.Probably could do things better, but I have time to work on and prepare for the next match.''