ISTANBUL, Turkey, Oct. 23 (UPI) -- World No. 1 Serena Williams beat third-seeded Agnieszka Radwanska and No. 2-ranked Victoria Azarenka also lost Wednesday at the WTA Championships in Istanbul.
Williams is 2-0 in the Green Group after a 6-2, 6-4 decision over Radwanska, who was virtually eliminated after losses each of the first two days of the tournament.