Jim "Mattress Mack" McIngvale has been known for his innovative nature, his enthusiasm, his philanthropy and for owning some fast horses. Now, he's about to make his mark as a stallion owner. Runhappy (Super Saver), the brilliant sprinter he owned who won the 2015 GI Breeders' Cup Sprint and nominated for three Eclipse Awards that year, will be represented for the first time at this fall's breeding stock sales as 23 of his weanlings will go through the ring. Runhappy broke records at Keeneland and Saratoga, while racing 100% medication free....