(Image Credit: Flickr / Telmo32) On May 5th, 2018, twenty thoroughbred horses and their jockeys will line up at the starting gate of Churchill Downs in Louisville, Kentucky. They’re there to win the roses (a symbol that their speed can’t be beat), the prize money, and America’s hearts. Each one of them has worked hard to get there, though, competing for months in qualifying races that rank them as the fastest horses, nationally. And 2018 will bring some additional international appeal as well. There are four qualifying series that comprise the Road to the 2018 Kentucky Derby. Traditionally, those qualifying…