Maryna Godwin & Ray Moore d. Linda Tuero & Jim Osborne 7-5 6-4
Patti Hogan & Paul Sullivan d. Carole Caldwell-Graebner & Donald Dell 6-3 7-5
Tory Ann Fretz & Gerry Perry d. Kristy Pigeon & Paul Hutchins 6-4 12-10
Laura Roussow & Tom Gorman d. Kanarek & Joaquin Loyo Mayo 6-3 4-6 6-3

Vicky Rogers & Chum Steele III d. Pam Teeguarden & Richard Leach 6-4 6-1
Peggy Michel & Butch Seewagen d. Julie Heldman & Torben Ullrich 13-11 6-4
Mary Ann Eisel & Peter Curtis d. Kathy Harter & Bailey Brown 4-6 6-2 6-3
Stefanie Defina & Dick Dell ?bye

Hogan & Sullivan d. Godwin & Moore 6-4 10-8
Fretz & Perry d. Roussow & Gorman 6-1 6-8 6-3
Michel & Seewagen d. Rogers & Steele default
Eisel & Curtis d. Defina & Dell 63 46 62

Semifinal

Fretz & Perry d. Hogan & Sullivan 6-2 3-6 6-4
Eisel & Curtis d. Michel & Seewagen 1-6 6-3 6-4

Final

Eisel & Curtis d. Fretz & Perry 6-4 7-5

NOTES: The 1968 US Mixed is a bit of an oddity. 1968 was the year of the first US Open Championships but just before it, in Boston, the US National Championships were also held, open to amateurs and registered professionals (i.e. pros who were independant and not contracted to the promoters).
The US Open at Forest Hills had no mixed doubles event but the Nationals did and that is it.