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

Oct 23 (Infostrada Sports) - Results from the WTA Championships Women's Singles Round Robin matches on Tuesday
RESULTS
Group B
2-Maria Sharapova(Russia)beat 7-Sara Errani(Italy)6-3 6-2
Group A
3-Serena Williams(U.S.)beat 5-Angelique Kerber(Germany)6-4 6-1
Group B
4-Agnieszka Radwanska(Poland)beat 6-Petra Kvitova(Czech Republic)6-3 6-2
STANDINGS
P W L F A Pts
Group A
1. Serena Williams 1 1 0 2 0 2
2. Victoria Azarenka 0 0 0 0 0 0
2=. Li Na 0 0 0 0 0 0
4. Angelique Kerber 1 0 1 0 2 0
Group B
1. Maria Sharapova 1 1 0 2 0 2
1. Agnieszka Radwanska 1 1 0 2 0 2
3. Sara Errani 1 0 1 0 2 0
3. Petra Kvitova 1 0 1 0 2 0