Coco Gauff ousted Karolina Muchova 6-1 6-4 at the United Cup, while Iga Swiatek overcame Elena Rybakina 7-6 (5) 6-4.
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In the opening rubber of the United States and Czech Republic semifinal, the 2023 US Open champion delivered a clinical performance firing eight aces and converting four of her eight break point chances.
What was expected to be a very tight contest, instantly became a one-sided matchup after the American started off by winning the opening five games.
After easily sealing the first set, Gauff also opened an early 2-0 second-set lead.
Down by a set and a break, Muchova finally showed some signs of life in the eighth game when she finally managed to get one break and tie the set to four games apiece.
However, the American remained unfazed - took the Czech's serve again in the ninth game - before routinely closing out the match in the following game.
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Now, Taylor Fritz can seal a place in the final for his nation if he beats Tomas Machac in the next match.
Swiatek defeated Rybakina to seal Poland's triumph
After Hubert Hurkacz saw off Alexander Shevchenko in the first rubber of the Poland and Kazakhstan tie, the top-ranked Polish female tennis player had everything in her hands.
But it was Rybakina who made the first move after opening a 5-3 lead and coming close to winning the opener.
On the verge of losing the first set, Swiatek stepped up - got the break back - and ultimately forced a tie-break, in which she also came up big to go up by a set.
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After stealing the first set, the Pole also broke the Kazakh in the seventh game of the second set and then just held on to her serve for the rest of the match to complete a two-set win.
If the United States beat the Czech Republic, Gauff and Swiatek will meet in the final.
