This is an interesting encounter that is now set up. Serena will take on 5th seed Petrova in the 3rd round. Petrova is obviously ranked much higher, Serena is 5-1 lifetime vs Petrova, her last win being a tough 3 setter in the 4th round of the 2004 Australian Open which Serena went on to win. Should be a hard hitting affair. I am going with the fitter and more confident player right now though.