UPDATE 2-Tennis-WTA Championships women's singles round robin results

Oct 25 (Infostrada Sports) - Results from the WTA Championships Women's Singles Round Robin matches on Thursday
RESULTS
Group B
7-Sara Errani(Italy)beat 9-Samantha Stosur(Australia)6-3 2-6 6-0
Group A
3-Serena Williams(U.S.)beat 1-Victoria Azarenka(Belarus)6-4 6-4
8-Li Na(China)beat 5-Angelique Kerber(Germany)6-4 6-3
STANDINGS
P W L F A Pts
Group A
1. Serena Williams 3 3 0 6 0 6
2. Li Na 2 1 1 2 2 2
3. Victoria Azarenka 2 1 1 2 3 2
4. Angelique Kerber 3 0 3 1 6 0
Group B
1. Maria Sharapova 2 2 0 4 1 4
2. Agnieszka Radwanska 2 1 1 3 2 2
3. Sara Errani 2 1 1 2 3 2
4. Samantha Stosur 1 0 1 1 2 0
5. Petra Kvitova 1 0 1 0 2 0