PARIS - French Open champion Li Na retired injured from her first-round match against Bulgarian Tsvetana Pironkova at the WTA Paris Indoor Open on Tuesday.
Third-seeded Li threw in the towel when she was 7-6 3-2 down as she was visibly suffering with a back problem and finally abandoned the match after receiving treatment courtside.
Li Na, the world number nine, has been struggling from a low competition form since her Paris Grand Slam victory last year, and the injury did no good to her preparation for a second French Open title and the upcoming Olympic Games.
Also on Tuesday, former world number one and the tournament's fourth seed Jelena Jankovic of Serbia pulled out with a thigh strain after failing to recover from a left thigh injury she picked up in a Fed Cup tie against Belgium last weekend.
"I am really disappointed not to play here," she told a news conference. "I don't know when I will be able to resume playing but I don't regret having played in the Fed Cup.