Maria Sharapova vs Elena Dementieva

So, I'm guessing no one watched the Sharapova/Dementieva match last night? It was really good. Sharapova won the first set, Dementieva won the second. Then in the third they were really close, but Sharapova pulled ahead and won. It was a good match and the footwork was nice too. However, there seemed to be an extrordinary numbere of double faults and hits that hit the top of the net (and didn't go over). Sharapova had fourteen double faults and Dementieva six, the last time I looked. Why so many?