Petra Kvitova says she has a lot of positives to take from her 2015 US Open campaign, despite a disappointing quarter-final exit to Flavia Pennetta.

Script: SOUNDBITE: Petra Kvitova (lost to Flavia Pennetta 4-6, 6-4, 6-2)

"I'm disappointing that I lost today for sure, but on the other side, I think I have a lot of positive things to take from the tournament. You know, it wasn't really easy situation. I'm just very -- I'm kind of proud of myself how I played here, anyway. I didn't really practice that much before. Everything was just like puzzles to take it together somehow and just take it together somehow and everything. Of course, I wish to play tomorrow semi-final, but on the other side is good."