Nineteen-year-old Czech Marketa Vondrousova will feature in the second week of a Grand Slam tournament for the first time in her career at the US Open, afte she defeated No. 13 seed Kiki Bertens in Saturday's third round, 7-6, 2-6, 7-6.
Vondrousova had never befort been past the second round at a Slam, but is the latest player from her country to have a breakout result on one of tennis' biggest stages in recent years.
Here are five fast facts on the breakout Czech teenager:
She is the youngest player left in the women's singles draw: Though she was the oldest of nine teenagers who had direct entry in the women's singles draw to start the tournament, Vondrousova is the only one still standing.
The Czech, along with fellow 19-year-olds Sofia Kenin and Vera Lapko, and 18-year-old Claire Liu, all reached at least the second round.
However, Vondrousova was the only one to reach the round of 32 - and has kept winning.
...but she hardly made it here: Ranked world No. 103 at the time of the entry cutoff, Vondrousova became the last direct acceptance in to the women's singles draw after a series of withdrawals.
In addition, her section of the draw opened up further as her originally-scheduled first round foe, No. 31 seed Mihaela Buzarnescu, who won the US Open Series event in San Jose, withdrew due to injury.
Vondrousova defeated lucky loser Mona Barthel of Germany in the first round, and former Wimbledon finalist Eugenie Bouchard in the second round.
She's made the most of her opportunity to reach the second week of a Grand Slam for the first time.
She owns a little bit of recent WTA history: Last season at age 17, Vondrousova won her first career WTA singles title in Switzerland as a qualifier ranked world No. 233.
The Czech was the lowest-ranked WTA finalist since an unranked Justine Henin reached the 2010 Australian Open final after coming out of retirement.
In addition, she was the youngest WTA title-winner since Ana Konjuh lifted the trophy in Nottingham in 2015.
She has a winning pedigree: Vondrousova is a former junior world No. 1 who reached three Grand Slam finals in doubles in juniors. In 2015, she won the girls' doubles events at the Australian Open and French Open alongside fellow Czech Miriam Kolodziejova.
She and American CiCi Bellis were also the runners-up at the French Open in 2014.
She has had success in the States this year: Vondrousova reached the fourth round of the BNP Paribas Open in Indian Wells in March, where she defeated then-No. 11 seed Johanna Konta and Belarus' Aryna Sabalenka.
However, she suffered a little bit of a sophomore slump since then, winning back-to-back matches at only two tournaments prior to arriving in New York.
"I didn't have best season, but I think this is coming back for me. This is my life's result, so I'm very happy. I think hard work has paid off," she said after Saturday's victory.
"It's like a dream. I'm very happy for it."
