World No. 1 seed Iga Swiatek's 18-match winning streak at the Australian Open came to an abrupt end on Saturday when the teenage Czech Linda Noskova upset her in the third round.
The top-seeded Polish player lost her way and fell 3-6, 6-3, 6-4 against the world number 50 in two hours and twenty minutes.
Just three of the top 10 women's seeds remain in the draw in Melbourne at the end of the first week.
"I'm speechless," said Noskova, who is at her first Australian Open. "I knew it was going to be an amazing match, but I didn't really think it would end up like this. "I'm just really glad to get through."
Noskova will face either Ukrainian 19th seed Elina Svitolina or Switzerland's Viktorija Golubic next.