Coco Gauff reached her maiden US Open quarter-final with a straight-set victory over China's Zhang Shuai.
Gauff, who is yet to drop a set at Flushing Meadows this year, will play France's 17th seed Caroline Garcia in the next round.
"It feels insane," said the 18-year-old. "Ashe Stadium chanting my name, I was trying not to smile."
Speaking to Amazon Prime, she said: "It was really physical, it felt like a three-setter.
"I really think my mentality helped me today.
"I'm so happy, being in my home Slam and finally getting to a quarter-final.