The term US Open is applied to open (as in anybody, even foreigners can compete) US-American championships in a particular sport. The most prominent ones are:
... Gordon Lightfoot
1987 The Guess Who[?]
1989 The Band
1990 Maureen Forrester[?]
1991 Leonard Cohen
1992 Ian and Sylvia[?]
1993 Anne Murray
1994 Rush
1995 ...