Tenth seed Karolina Pliskova cruised into the US Open semi-finals with a straight-set defeat of Ana Konjuh.
Pliskova, of the Czech Republic, triumphed 6-2 6-2 to reach the last four of a Grand Slam for the first time in New York.
She dominated from the start and needed just 57 minutes to see off the 18-year-old Croatian at Flushing Meadows.
Pliskova will face either fifth seed Simona Halep or world number one Serena Williams in Friday's semi-finals.