Petra Kvitova reaches a US Open quarterfinal for the first time in her career. This completes her quarterfinal or better appearance in all the grand slams. This is her ninth appearance in a grand slam quarterfinal.
This was her path to a maiden quarterfinal appearance -
1R: Laura Siegemund (GER) (#126)
2R: Nicole Gibbs (USA) (#117)
3R: Anna Karolina Schmiedlova (SVK) (#32)
4R: Johanna Konta (GBR) (#97)
QF: Flavia Pennetta (ITA) (#26)