Quarter-finals:
[1] Rachael Grinham (AUS) bt [5] Rebecca Chiu (HKG) 9-3, 9-7, 9-5
[3] Jenny Duncalf (ENG) bt Line Hansen (DEN) 9-4, 9-2, 9-3
[4] Shelley Kitchen (NZL) bt [6] Kasey Brown (AUS) 9-2, 9-5, 9-3
[2] Natalie Grainger (USA) bt [8] Latasha Khan (USA) 9-4, 9-4, 9-3
The top four seeds safely negotiated the quarter-finals of the Women's Vassar College Class of 1932 Open to earn their anticipated places in the semi-finals of the WISPA World Tour Silver squash event in Poughkeepsie in the US state of New York.
Maintaining the form which saw her win her third British Open title last month, Rachael Grinham despatched Hong Kong's No5 seed Rebecca Chiu 9-3, 9-7, 9-5.
The top-seeded Australian will now face Jenny Duncalf after the third seed from England ended unseeded Dane Line Hansen's run in a 9-4, 9-2, 9-3 scoreline.
The other semi-final will be a US/New Zealand affair between second seed Natalie Grainger, the Pan American Games champion from Washington DC, and fourth seed Shelley Kitchen, the Commonwealth Games bronze medallist from Auckland.
Kitchen defeated Australian Kasey Brown 9-2, 9-5, 9-3 while Grainger confirmed her status as the country's top player by defeated US compatriot Latasha Khan 9-4, 9-4, 9-3.
Semi-final line-up:
[1] Rachael Grinham (AUS) v [3] Jenny Duncalf (ENG)
[2] Natalie Grainger (USA) v [4] Shelley Kitchen (NZL)