Karolina Muchova stuns Ashleigh Barty with fightback to clinch semi-final spot

Karolina Muchova ended the hopes of home favourite Ashleigh Barty in the quarter-final stage of the Australian Open (Andy Brownbill/AP/PA)

Karolina Muchova stunned world number one Ashleigh Barty with a sensational comeback sparked by a medical time-out to progress into the Australian Open semi-finals following a 1-6 6-3 6-2 win.

The 25th seed looked out of sorts in a first set which lasted only 24 minutes and at this stage it seemed the home favourite sealing her place in the last four was a formality.