Do you count national championships as a major one-day race?
I guess NCs could be and have in some countries at certain points definitely also been major one-day races, but I won't put the the British RR of the 90s in that category. I reckon that Smith himself will call it a major race (he does mention it on Twitter), cause it probably was for a British rider at the time, but there are a too many races that rank above it in my book. I was however tempted to promote GP Herning
If not, Brian Smith? Yes
Female?
Asian?
Retired?