
Radwanska, Wozniacki, Kvitova advance to Dubai quarterfinals
DUBAI, United Arab Emirates (AP)—Defending champion Agnieszka Radwanska led several of the top seeds into the Dubai Championships quarterfinals on a Wednesday overshadowed by the withdrawal of Serena Williams because of a back injury. Williams, who became the oldest top-ranked woman Monday, said she's had a sore back and ankle