The Greatest Kentucky Derby Myth of All

One of the things I find fascinating about horseracing — well, life, really — is what folks accept as true that isn’t. Conclusions that seem logical are often considered fact regardless of how strong or weak the supporting data is — or whether there is any supporting data at all.

Take, for example, the popular belief that if you eat something and go swimming immediately afterward, you will invariably cramp up and die from drowning (presumably while cursing yourself for ordering the McPick 2 instead of the McPick 1 on your rigid descent to the bottom of the pool).

On the surface, this sounds plausible; the logic being that the blood going to one’s digestive tract depletes the limbs of blood needed to propel one through the water.

The only problem is it’s not true.

According to Dr. Mark Messick on the Duke Health Blog, “the body does supply extra blood to aid in digestion, but not enough blood to keep your arm and leg muscles from properly functioning.”

Along a similar vein (see what I did there?), many horse bettors believe that future Kentucky Derby winners usually show their potential early. However, a recent study I conducted destroys this supposition.


While the Curse of Apollo — no horse has won the Kentucky Derby without starting as a 2-year-old since Apollo in 1882 — is still alive and kicking, adding Battle of Midway and Patch to its list of victims last year, it can be argued that showing immediate promise as a juvenile is actually a negative when it comes to winning the Run for the Roses.

Since 1992, horses that broke their maidens in their very first lifetime start have won the Kentucky Derby eight times, which seems great until one considers that the winning percentage for the 187 horses that showed this characteristic (4.3 percent) is less than the winning percentage for the 291 that didn’t (6.2 percent).

In other words, horses that were victorious in their lifetime bow won the roses less than expected. Worse, they were bet like they were the next coming of Secretariat, averaging $19.35 to win, compared to the $32.00 average Derby mutuel produced by non-debut winners.


Related to this, horses that were well-bet in their first-ever race have also performed below expectations in the Derby. Over the past 26 years, animals that went to post at odds of less than 3-1 or who were favored in their first career start, have visited the Kentucky Derby winner’s circle just four percent of the time and returned an average of 79 cents for every $2 bet (a return on investment of -60.6 percent).

On the other hand, horses that went postward at odds of 6-1 or greater in their debut have won the Derby 14 times and produced a profit of 31.7 percent since ’92.


So, the next time somebody tells you that a horse needs to have won and been highly regarded early to triumph in The Most Exciting Two Minutes in Sports, grab a bite, take a swim and smile… all the way to the bottom (I’m kidding, I’m kidding).


Derek Simon
Derek Simon is the Senior Editor and Handicapper at US Racing.