Swiatek will face No. 19 Madison Keys of the U.S. on Thursday night for a berth in the final. The other women’s semifinal is No. 1 Aryna Sabalenka, the two-time defending champion, against her good friend, No. 11 Paula Badosa.

Ben Shelton wore down Italian Lorenzo Sonego 6-4 7-5 4-6 7-6 (4) in a highlight-laden clash and ensured the US has players in the men's and women's semifinals for the first time since Andy Roddick and Serena Williams in 2009.

Three of the four top seeds will compete for the titles over the weekend, with an American looking to play spoiler