Tennis: Qatar Open results - 2nd update

Results on the fifth day of the WTA Qatar Open on Friday (x denotes seeded player):

Women's singles quarter-finals

Maria Sharapova (RUS x3) bt Samantha Stosur (AUS x8) 6-2, 6-4

Victoria Azarenka (BLR x1) bt Sara Errani (ITA x6) 6-2, 6-2

Serena Williams (USA x2) bt Petra Kvitova (CZE x7) 3-6, 6-3, 7-5

afp