After Vicotira Azarenka pulled out due to a knee injury four other former world number one players lost their second round matches.
Former Wimbledon champion Maria Sharapova was knocked out in the second round by qualifier Michelle Larcher De Brito 6-3,6-4. Sharapova also lost in the fourth round last year. Former world number ones Ana Ivanovic and Caroline Wozniacki also suffered surprised second round defeats to Canada's Eugenie Bouchard and Petra Cetkovska respectively. Bouchard beat the Serbian 6-3,6-3 meanwhile Cetkovska eased passed Wozniacki 6-2,6-2