26 Oct 2012

Williams unbeatable in Istanbul

11:43 am on 26 October 2012

The American tennis player Serena Williams has gone through group play unbeaten at the WTA Championship in Istanbul after beating world number one Victoria Azarenka in straight sets.

Azarenka will meet Li Na to decide the other semi-finalist from the group, after the Chinese beat Angelique Kerber in the day's other group match.

Meanwhile in the other group Sara Errani picked up her first win with a three-set victory over Sam Stosur.

Maria Sharapova tops that group from Agnieszka Radwanska and Errani.