 In 2007, he bought a controlling interest in Curlin, who won the Preakness Stakes and the Breeders' Cup Classic that year.In 2008, the horse won the $6 million Dubai World Cup.Fresh on the heels of Curlin's success, Jackson's Stonestreet Stables, along with Harold T. McCormick, announced on May 6, 2009, the purchase of Rachel Alexandra, winner of the Kentucky Oaks by more than 20 lengths and undefeated in 2009.