The key moment in an enthralling final set came at 3 - all when Williams broke to claim an advantage she never relinquished and set up a meeting with either Andrea Petkovic or British qualifier Anne Keothavong .
Either Andrea Petkovic is the 30th seed from Germany .
The key moment in an enthralling final set came at 3 - all when Williams broke to claim an advantage she never relinquished and set up a meeting with either Andrea Petkovic , the 30th seed from Germany , or British qualifier Anne Keothavong .