World number one Iga Swiatek is out of the Australian Open after being stunned by Czech 19-year-old Linda Noskova in the third round.
The Pole, 22, had looked in control but the highly-rated Noskova fought back to win 3-6 6-3 6-4 on Rod Laver Arena.
Noskova is playing in the main draw in Melbourne for the first time, having lost in qualifying last year as an 18-year-old. She is the first teenager to beat a world number one at a Grand Slam since Petra Kvitova overcame Dinara Safina at the 2009 US Open.
The loss also ended Swiatek’s 18-match unbeaten run, which stretched back to September.
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Noskova will play Ukrainian 19th seed Elina Svitolina next.