Karolina Pliskova reached her first Grand Slam semi-final as she swept past Croatian teenager Ana Konjuh 6-2 6-2 in just 57 minutes.
Pliskova won the opening four games of the match, as well as the last five, en route to a comprehensive victory.
The No 10 seed from the Czech Republic has fired more aces this season than any other player on the WTA Tour and she opened the match with a bang.
In the opening set, she lost just a single point on serve, which she clinched in just 28 minutes. The second set was a slightly longer affair, although the result never looked in doubt.
Pliskova said: "It's an amazing feeling. I am so excited to be in my first semi-final especially in this tournament. I very much love New York and the hardcourt season.
"I think I played a very good match today. I did a quick break in the first game which helped me and I was more calm then and going for my shots."
Pliskova will face the winner of the next quarter-final between world No 1 Serena Williams and Romanian fifth seed Simona Halep.
A disappointed Konjuh, the world No 92, admitted: "I wasn't at my best level today for sure but she was just too good.
"Her serve is just too good. She found her rhythm and took the opportunities that I gave her."