Fifteen-year-old Coco Gauff continues to blaze a trail through the tennis world.

Gauff, currently ranked No. 110 in the world, on Friday became the youngest player in 15 years to reach a WTA semifinal. The Florida native is the youngest semifinalist since Nicole Vaidisova won a tournament in Uzbekistan when she was 15 in 2004.

Gauff defeated world No. 8 Kiki Bertens 7-6(1), 6-4 in the quarterfinals of the Upper Austria Ladies Linz tournament in Austria. It was her first career victory over a player ranked in the top 10. Gauff will face Germany’s Andrea Petkovic, ranked No. 75, in Saturday’s semifinals.

“There have been a lot of firsts this week,” Gauff said, according to Agence France-Presse. “I’m really happy and proud of how I’m playing. It’s crazy today, beating a top 10. I’m super proud for what I’ve done. I couldn’t ask for anything better at this event.”

Gauff is set to crack the top 100 when the WTA rankings are updated on Monday. Gauff will be the only player under the age of 18 ranked in the top 100.

Gauff has enjoyed a breakthrough 2019 season, making a stirring run to the fourth round of Wimbledon that included an upset of Venus Williams. Gauff followed that up by advancing to the third round of the US Open, where she lost a memorable match to Naomi Osaka. Gauff’s new ranking assures her a spot in the main draw of the Australian Open in January.