Wozniacki retires with injured ankle, Li Na advances to semifinals of Warsaw Open

Wozniacki retires, Li Na advances in Warsaw Open

WARSAW, Poland — Top-seeded Caroline Wozniacki retired with an injured ankle while trailing Zheng Jie of China 6-3 Thursday in the quarterfinals of the Warsaw Open.

In the semifinals, Zheng will face either Greta Arn of Hungary or sixth-seeded Alona Bondarenko of Ukraine.

In the other semifinal, third-seeded Li Na of China will face Alexandra Dulgheru of Romania, who advanced after edging Tsvetana Pironkova of Bulgaria 6-4, 7-5.

Li beat Sara Errani of Italy 6-2, 6-1.