Karolina Pliskova eased into the US Open semi-finals with a 6-2 6-2 victory over Ana Konjuh on Wednesday.
The Czech 10th seed is on her best ever run at a grand slam tournament, having never previously made it beyond the third round.
And the 24-year-old remains on course to become her country's first champion at Flushing Meadows, completing the set for a nation that already has winners in Australia, France and Wimbledon.
This was also unseeded Konjuh's best major run but, after seeing off fourth seed Agnieszka Radwanska in the last round, she proved no match for her opponent on Arthur Ashe Stadium.
Pliskova raced into a 4-0 lead before squandering three opportunities to go five up and leave herself serving for a first-set whitewash.
The world number 11 eventually wrapped up the set and, after sharing the opening four games of the second, she stepped up a gear once again to secure victory, ending the match with back-to-back aces.
Pliskova will now meet Serena Williams or Simona Halep in the last four.
Pliskova  bt Konjuh 6-2 6-2
Pliskova - 15/12
Konjuh - 15/27
Pliskova - 3
Konjuh - 4
BREAK POINTS WON
Pliskova - 4/9
Konjuh - 0/0
FIRST SERVE PERCENTAGE
Pliskova - 65
Konjuh - 50
PERCENTAGE OF POINTS WON ON FIRST/SECOND SERVE
Pliskova - 92/77
Konjuh - 57/46
Pliskova - 59
Konjuh - 34