Czech Karolina Pliskova blew past Croatian teenager Ana Konjuh 6-2, 6-2 on Wednesday to reach the semi-finals of the US Open.
Tenth-seeded Pliskova, who survived a match point in her fourth-round victory over sixth-seeded Venus Williams, will face either world number one Serena Williams or fifth-seeded Romanian Simona Halep for a place in Saturday's championship match.
"I'm so excited to be in my first semi-final," said 24-year-old Pliskova, who had failed to make it out of the third round in 17 prior Grand Slam appearances.
Having broken through to the quarters she didn't waste her opportunity.
With a quick break under her belt in the opening game she was able to swing freely and needed just 57 minutes to subdue Konjuh, who upset fourth-seeded Agnieszka Radwanska in the fourth round.
"I think it was the serve," said Pliskova, who finished off the match with two of her three aces. "My serve was very good today."