Haven't we seen this before?

The top seed went out in her first round, Andrea Petkovic beat Petra Kvitova in straight sets, Sam Stosur defeated Li Na: This is Cincinnati, but we've seen it all before--a week ago. As unlikely as it seemed that all three of these events could happen again so soon, they indeed did.

I talked about Caroline Wozniacki yesterday. Today, I ask: What is going on with Kvitova? Is it just her old pattern of playing inconsistently in tournaments? Is her injury (which she's had, in one form or another, since January) continuing to bother her? Or, as some have pointed out, is the high humidity just too much for her compromised respiratory system? I wasn't able to watch today's match (it wasn't available for viewing) and don't know why Kvitova took a medical time-out. Of course, it isn't unusual for someone to win a major and then slump--it could be as simple as that. Or it could be several factors. Whatever it is, I hope the Czech player finds the solution soon.

Petkovic defeated Kvitova for the second time in two weeks, and 10th seed Sam Stosur defeated 5th seed Li Na for the second time in two weeks, and the fifth time in her career. Today marked the first time Li has ever taken a set off of Stosur. Daniela Hantuchova upset 8th seed Marion Bartoli, 16th seed Peng Shuai defeated Shahar Peer, and Nadia Petrova defeated wild card Christina McHale, the player who upset Wozniacki.

2nd seed Vera Zvonareva defeated qualifier Petra Martic, and 4th seed (and wild card) Maria Sharapova defeated 14th seed Svetlana Kuznetsova.

2nd seeds Gisela Dulko and Flavia Pennetta went out today; they were defeated in the quarterfinals by Ekaterina Makarova and Zheng Jie. Top seeds Kveta Peschke and Katarina Srebotnik advanced, as did Natalie Grandin and Vladimira Uhlirova. Grandin and Uhlirova defeated French Open champions Andrea Hlavackova and Lucie Hradecka yesterday. Today, they defeated Maria Kirilenko and Nadia Petrova. And in the final match of the day, 3rd seeds Vania King defeated 5th seeds and Rogers Cup champions Liezel Huber and Lisa Raymond.