Rough'n Tumble (foaled in 1948) was an American Thoroughbred racehorse who won the Santa Anita Derby and became what Bloodhorse called "one of the most successful stallions in Florida breeding history." Rough'n Tumble was purchased privately for less than $5000 by Frances Genter, who entrusted his race conditioning to trainer Melvin Calvert. As a two-year-old, Rough'n Tumble won the Primer Stakes at Arlington Park and at three, he captured the most important race for his age group in California: the Santa Anita Derby