Serena storms back to oust Petrova

Serena Williams advanced to the fourth round of the Australian Open after coming back from the brink of defeat to down fifth seed Nadia Petrova 1-6 7-5 6-3 today.

A winner in Melbourne in 2003 and 2005, Williams is unseeded because her ranking slipped substantially in 2006, when she missed much of the year with a left knee injury.