Forget American Pharoah and Secretariat's legendary Kentucky Derby runs ... Saturday's DQ finish was the MOST shocking moment in race history, so says HOF jockey Jerry Bailey.
"By far," Jerry tells TMZ Sports ... "This Kentucky Derby will be remembered for a long time."
You've seen the story by now ... Maximum Security's epic Derby victory this past weekend was vacated after a review showed the horse impeded others on the race track.
A lot of people -- including President Donald Trump -- called the decision to overturn the result B.