Melbourne: Czech fourth seed Petra Kvitova crashed out of the Australian Open on Saturday, falling in straight sets to unseeded American teenager Madison Keys, who is coached by former great Lindsay Davenport.


Petra Kvitova reacts during her match against Madison Keys in Melbourne on Saturday. Pics/AFP, Getty Images 

World No 35 Keys, 19, defeated the reigning Wimbledon champion 6-4, 7-5 in the third round, setting up an all-American Last 16 clash with Madison Brengle.