There are a number of prep races that horses use to prepare for the online Kentucky Derby betting and it these races we want to take a look at and how they apply to Derby betting. Online Derby betting stats will show that over the past two decades six prep races have produced the Derby winner. The Santa Anita Derby has produced six winners, the Blue Grass Stakes five winners, the Wood Memorial, four winners, the Arkansas Derby three winners, the Lexington Stakes one winner and the Illinois Derby one winner. Even though the Blue Grass Stakes has produced a lot of online Derby betting winners, it has not had any winners in the last decade.