Karolina Muchova upsets world No. 1 Ashleigh Barty to reach Australian Open semifinals

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Top-ranked Ash Barty has been upset by No. 25-seeded Karolina Muchova in the quarter-finals at the Australian Open, 1-6, 6-3, 6-2, ending her bid to become the first Australian woman to win the title in Melbourne since Chris O'Neil in 1978.