Li Na beats Jelena Jankovic at WTA Championships

The Associated Press
Li Na beats Jelena Jankovic at WTA Championships
Li Na of China waves after defeating Sara Errani of Italy during their tennis match at the WTA championship in Istanbul, Turkey, Wednesday, Oct. 23, 2013. The world's top female tennis players compete in the championships which runs from Oct. 22 until Oct. 27.(AP Photo)

ISTANBUL (AP) -- Li Na outlasted former doubles partner Jelena Jankovic 6-3, 2-6, 6-3 on Thursday for her second victory in two matches at the WTA Championships.

The key to the error-filled match full of long rallies was Li's break of serve in the third set for a 4-3 lead.

The fourth-seeded Li has a 2-0 record in her group and looks likely to advance to the semifinals for the first time. The seventh-seeded Jankovic is 1-1. Jankovic is back in the tournament for the first time in three years.

The tournament brings together the top eight players in the world, who are split into two round-robin groups. The two top finishers in each pool advance to the semifinals.

Li beat Jankovic in the round of 16 at the U.S. Open.