Karolina Muchova said she was living a dream on Thursday after staging a stunning comeback to upset World No. 1 Ashleigh Barty and storm into the Australian Open semi-finals, rallying from a set down.

The Czech 25th seed looked on her way out after Barty raced through the opening set, but after a medical timeout Muchova returned a different player to win 1-6, 6-3, 6-2 on Rod Laver Arena as the Australian crumbled. She will face Jennifer Brady for a place in the final after she American beat Jessica Pegula 4-6, 6-2, 6-1.