In the four quarters planned for Friday today, World Number One V. Azarenka beat 35th ranked German M Berthel in an interesting and quite tough encounter 6-4, 6(3)-7(7) and 7-5.
Earlier, 4th seeded Polish Radwanska beat 8th seeded Chinese N Li 3-6, 6-2, 6-3.
Of the remaining two quarters, the third match between World Number Two Russian Maria Sharapova and US Open winner fifth seeded Australian Samantha Stosur is in play with 6-6 in the first set.
