Great Britain will be represented in two doubles finals on Sunday after Colin Fleming, Ross Hutchins and Heather Watson all won last-four matches.
Fleming and Hutchins, the second seeds at the Hall of Fame Championships in Newport, Rhode Island, beat another Briton Dominic Inglot and his Filipino partner Treat Conrad Huey 7-6 (7/4) 6-4.
The London 2012 medal hopefuls will now face Santiago Gonzalez and Scott Lipsky for the grasscourt title.
Meanwhile, Watson and doubles partner Marina Erekovic came out on top of a topsy-turvy match with Natalie Grandin and Vladimira Uhlirova to make the final of the Bank of the West Classic in Stanford.
The British 20-year-old and New Zealander Erekovic won it on a super tie-break to finally beat the third seeds 7-5 6-7 (6/8) 10-7 in just over two hours.
The pair, who came back from 5-2 down in the second set and served for it at 6-5 up, will take on top seeds Jarmila Gajdosova and Vania King in the final.