Biggest upset of the day: Sixth seed Petra Kvitova knocked out of Australian Open by Daria Gavrilova

Twice Wimbledon champion Petra Kvitova was sent tumbling out of the Australian Open in the second round by Daria Gavrilova on Wednesday, stunned 6-4 6-4 by the 21-year-old local.

The Czech sixth seed, a semi-finalist at Melbourne Park four years ago, made 35 unforced errors and was broken five times in the 89-minute contest, to the delight of the partisan crowd on Margaret Court Arena.

Kvitova rallied to save a match point and break back for 5-4 in the final set but Gavrilova claimed the victory when the world number seven went long with a forehand in the next game.

Moscow-born Gavrilova, who paired up with Nick Kyrgios to win the Hopman Cup for Australia at the start of the year, will play France's Kristina Mladenovic in her first trip to the third round at a grand slam.

Come onnnnnn!!!! pic.twitter.com/KbwkfxOpvb

— Daria Gavrilova (@Daria_gav) January 20, 2016