World No 1 Iga Swiatek has been knocked out of the Australian Open at the third round in a shock defeat to 19-year-old Linda Noskova.
Swiatek had been on a 17-match winning streak dating back to September last year, which included the China Open title and the WTA Finals.
She had looked shaky in her opening two matches of the Australian Open against Sofia Kenin and Danielle Collins.
The Polish tennis star was the overriding favourite for her third-round match against up-and-coming talent Noskova.
Iga Swiatek has been knocked out of the Australian Open
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But the teenager pulled off the biggest upset of the tournament so far by coming back from a set down to end Swiatek's winning run.
The Czech Republic tennis ace collapsed to her knees after her victory and was seen wiping away tears.
The Rod Laver Arena were up on their feet to applaud Noskova and the tears began to flow again when she sat back down in her chair.
It's the earliest a top seed in the women's draw has been knocked out of the Australian Open since 1979 when Virginia Ruzici lost in the first round of the tournament.
Swiatek had also been on a run of 14 consecutive Grand Slam tournaments where she had reached the fourth round at least.
Noskova's emotions were evident during her on-court interview with the teenager's voice shaking at times.
"I'm speechless," she began.
"I knew it was going to be an amazing match with the world No 1 but I didn't really think it would end up like this.
Linda Noskova was overwhelmed with emotion
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"I'm just really glad to get through this round."
The Czech Republic have been producing several top stars on the women's tour for the past few years now with Barbora Krejcikova Marketa Vondrousova winning majors recently.
Along with Karolina Muchova and Petra Kvitova, the Czech Republic have four players inside the top 18 of the WTA rankings.
Mats Wilander was left stunned by Noskova's display on Rod Laver Arena and paid credit to the Czech Republic for producing another top talent.
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Linda Noskova was loudly cheered on Rod Laver Arena
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"It's just another fearless teenager," he said on Eurosport.
"They just keep coming up and the Czech Republic are producing so many great female tennis players.
"They come out with different styles as well but they all have a very consistent game and, more than anything, a consistent game plan.
"It's just an amazing win. To play in front of 15,000 for the first time and be that relaxed and to serve it out. Can't imagine how it felt."