Gauff, ranked No 7, will face the winner of the match between Karolina Muchova and Belarusian Aryna Sabalenka, the second seed, next.

Ahead of her victory, the 19-year-old American defeated Egyptian Mayar Sherif (6-2, 6-2), qualifier Linda Noskova (6-4, 6-0) and Italian qualifier Jasmine Paolini (6-3, 6-2).

Swiatek, ranked No 1, won against American wildcard Danielle Collins (6-1, 6-0), Chinese Qinwen Zheng (3-6, 6-1, 6-1) and No 10 seed Marketa Vondrousova (7-6 (3), 6-1) in the previous rounds of the Cincy Open.

Cincinnati WTA 1000, other semi-final result (Linder Tennis Family Center, hard, USD 2.788.468):

• Karolina Muchova vs. Aryna Sabalenka