Re: Maria's problem against Serena Williams
Actually it's everyone's problem
Maria struggles against Serena because her return and reflex to Serena's serve aren't good enough and she can't defend at all.
Maria Sharapova Na Li Francesca Schiavone Vera Zvonareva Petra Kvitova
Novak Djokovic Roger Federer Tomas Berdych Juan Martin Del Potro Richard Gasquet