The sixth-seeded American swept the first set and needed just 68 minutes to book the first women's singles semifinal spot.

Taylor Fritz, the No. 9 seed in the men's singles draw, could not find his game against No. 2 seed Novak Djokovic.

Fritz played better after a disastrous first set, but he made too many errors against the winningest men's singles player in history.

Gauff will be joined by at least one more American in the US Open semifinals. Frances Tiafoe, a semifinalist in New York last year, faces fellow countryman Ben Shelton in the nightcap inside Arthur Ashe Stadium.