The ongoing Keeneland September yearling sale in Lexington, Ky., is the premier event each year in the Thoroughbred world for those in search of future superstar racehorses. It’s a 12-day-long event from Sept. 8-20 with roughly 4,700 horses cataloged and it offers owners many opportunities to test their skill at identifying next-gen standouts while backing those opinions up with dump trucks filled with dollars.