Over the last 25 years, Kentucky Derby winners have finished their last prep race with an average placing of 1.96. Here's a look at where they came from.

A look back at some of the most memorable Derby prep races over the last twenty years.

By Alex Waldrop, NTRA.com Like many of you, I watched Saturday's Kentucky Derby and was in awe of the amazing performance of Big Brown and his talented jockey, Kent Desormeaux. Big Brown ran a race from the 20th post position that was remarkable. And Desormeaux rode a race that even I could appreciate as very skillful. Unfortunately for racing, events unfolded after the race that completely overshadowed Big Brown's impressive performance.

For Big Brown, undefeated but having raced only three times, the Derby (4 p.m. ET, NBC; post time 6:04) is a chance to validate the hype that has made such an inexperienced colt the favorite among oddsmakers to win the most prestigious event in American horse racing.