Agnieszka Radwanska advances
DUBAI, United Arab Emirates -- 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 since the Australian Open, though she still reached the final in Qatar last weekend.
Her departure, announced 45 minutes before she was to face 11th-ranked Marion ...
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