Li Na of China reacts in the third set during her women's singles tennis match against Klara Zakopalova of the Czech Republic at the Wimbledon Tennis Championships, in London June 29, 2013.  [Photo/Agencies]

LONDON - China's Li Na fought back from one set down to beat Czech 32nd seed Klara Zakopalova on Saturday to reach the fourth round of the Wimbledon Championships.

Li, the sixth seed and 2011 French Open champion, took two hours to win 4-6, 6-0, 8-6.

She was trailing 5-6 in the final set with Zakopalova serving, but she broke the 31-year-old Zakopalova to level the score, holding her own and breaking again for the win.

"I was really happy I didn't give up," Li said. "She played pretty flat and also pretty deep. Sometimes I have to dig my knees in the ground."

Li, two days younger than Zakopalova, will next take on Italian 11th seed Roberta Vinci for a place in the quarterfinals.

"I saw her play a little bit today when I was waiting for my match," Li said of Vinci. "She has pretty good slice in the backhand. There are not so many girls to do that, especially in the grass court. So I have to fight."