After top seed Schiavone's shock departure on Tuesday, Vinci fared no better as she was broken five times by the world number 46, who cantered to victory in just 64 minutes.

Sixth seed Petra Cetkovska of the Czech Republic also fell, 6-2 6-4 to Carla Suarez Navarro of Spain, but seventh seed Sara Errani made it through with a 6-0 6-2 win over Estrella Cabeza Candela.

In the only first round match on Wednesday, Romania's Sorana Cirstea took the first set 6-4 against eighth seed Polona Hercog before Hercog was forced to retire at the start of the second.