PETRA Kvitova's Wimbledon dream has been shattered by 95th-ranked American Madision Brengle.

Despite being among the tournament favourites, many labelled Kvitova's hopes of a third Wimbledon title as a "fairytale", with the Czech only recently returning after six months out of the game following a horrific knife attack in her home.

Kvitova, who required four hours of surgery and didn't touch a racket for three months, admitted she struggled physically in her -3 1-6 6-2 loss to Brengle.

"My body just didn't really do the best, unfortunately," she said.

"But I was really trying. I fight, but I could just not breathe and I was feeling a bit sick.

"That sometimes happens. Unfortunately it happened at Wimbledon, which is not nice. It was just tough for me to still have the energy to play my aggressive game."

Despite a groundswell of support for the popular tour personality, Kvitova said she didn't buy into title favouritism talk.

"I said before that I didn't really feel the favourite of the tournament and I didn't really think about the title here," she said.

"In Birmingham (where she won the title) maybe it was a fairytale but I still have to work hard. The six months is missing. I need to play more matches. I need to practise a lot, as well."

Kvitova said she is now hoping to get back to her traditional preparation schedule ahead of August's U.S. Open.