There are 41 states that legalize online horse racing betting, with Texas having an in-person option. It's not available in every state, but it is available in more states than online sports betting. The Kentucky Derby is among the most popular betting events in the U.S. Only 13 horses have won the Kentucky Derby, Preakness Stakes, and Belmont Stakes to complete the Triple Crown. Every year, 20 three-year-old horses take their shot at the Triple Crown. Saturday marks the 149th running of the Kentucky Derby.
