With a comeback win over former World No.1 Caroline Wozniacki during the U.S. Open at Arthur Ashe Stadium in New York on Sunday, 19-year-old U.S. tennis star Coco Gauff became the first American teenager to reach the tournament’s quarterfinal round in back-to-back seasons since Serena Williams in the late 1990s.

Gauff entered the tournament as the Women’s Tennis Association’s (WTA) sixth-ranked player. She has defeated Laura Siegemund, Mirra Andreeva, Elise Mertens, and Wozniacki, who was playing in her first Grand Slam since returning from retirement, to reach the quarterfinal, where she lost to France’s Caroline Garcia a year ago.

This time, Gauff will face the WTA’s 21st-ranked player, Jelena Ostapenko, who knocked off WTA No.1 and defending U.S. Open champion Iga Swiatek on Sunday.

“I always expect a tough battle against Iga,” Ostapenko said after the game, per Eurosport. “She’s won many Slams and she plays very consistently. I just went on court and I had to play aggressive because that’s what she doesn’t really like. In the third set, I stepped more in the court and I was serving better.”

Ostapenko has been competing on the professional tennis circuit since 2012 and has 333 career victories with one Grand Slam title (2017 French Open). Gauff has 167 wins in her five-year career but has only advanced past the quarterfinals of a Grand Slam once, reaching the 2022 French Open Final, and has never won a Grand Slam.

The quarterfinal match will be the third time the pair have squared off, each winning once previously. They played each other at the Australian Open in January, with Ostapenko emerging victorious.

While Gauff’s future success in the tournament remains to be seen, Williams kept her streak going for four years, winning the U.S. Open twice and making three appearances in the tournament’s championship match.

Williams also became one of the most decorated athletes ever, winning 23 Grand Slams in her career.

Gauff and Ostapenko will play at 11 a.m. CT on Tuesday in New York. The winner will take on Romania’s Sorana Cirstea or the Czech Republic’s Karolina Muchova in the semifinals at 11 p.m. CT on Wednesday.