Reigning Wimbledon champions Sania Mirza and Martina Hingis earned their third consecutive win to top the red group and enter the semi-finals of the year-ending $7 million WTA Finals being played at the Singapore Indoor Stadium here on Wednesday.
Following their victories in the opening two round robin matches earlier this week, the Indo-Swiss combine came up with another top-class performance to beat Hungarian-French fourth seeds Tímea Babos and Kristina Mladenovic 6-4, 7-5 in one and a half hours.