Result grid
Group A
Serena Williams
Petra Kvitova
Angelique Kerber
Agnieszka Radwanska
Points
Serena WilliamsS Williams
3
Petra KvitovaKvitova
2
Angelique KerberKerber
1
Agnieszka RadwanskaRadwanska
0
Group B
Li Na
Jelena Jankovic
Victoria Azarenka
Sara Errani
Points
Li NaLi Na
3
Jelena JankovicJelena Jankovic
1
Victoria AzarenkaAzarenka
1
Sara ErraniSara Errani
1