John W. Sadler is an American horse trainer in the sport of Thoroughbred horse racing. Sadler got his first win in 1979 at Golden Gate Fields racetrack in the San Francisco Bay Area. Since then he has become a very successful trainer and prominent figure in California horse racing, winning numerous important races including the 2018 Breeders' Cup Classic. In April 1991, Sadler won the first match race ever at Santa Anita Park when Valiant Pete, winner of the 1990 California Cup Sprint, equaled the world record of 0:44 2/5 for four furlongs in defeating champion American Quarter Horse Griswold in a $100,000 winner-take-all race. At Hollywood Park on June 28, 2008, Sadler won three stakes races when Whatsthescript won the Grade 2American Handicap, Dearest Trickski triumphed in the Grade 2 A Gleam Handicap and Emmy Darling took the Landaluce Stakes. On December 26, 2010, he repeated this performance at Santa Anita, when Twirling Candy won the Grade I Malibu Stakes, Switch won the Grade I La Brea Stakes and Sidney's Candy won the Grade IISir Beaufort Stakes. Sadler won three stakes races for the third time at Hollywood Park on July 17, 2012 when Scherer Magic won the Grade 3 Hollywood Juvenile Championship, Switch in the Grade 2 A Gleam Handicap and Lady of Shamrock in the Grade 1Hollywood Oaks. In 2011, surpassed $70 million earned in purses. His career purse earnings reached $100 million in 2015. In November 2012, John Sadler won his 2,000th race when Rooster City won a claiming race at Betfair Hollywood Park. Sadler has won training titles at Hollywood Park, Santa Anita, Del Mar. Other top thoroughbreds for Sadler include Alpha Kitten, Appealing Missy, Belmont Cat, Black Mamba, Cost of Freedom, Dawn After Dawn, Dearest Trickski, Evita Argentina, Frost Free, Geronimo, Get Funky, Hasty Kris, Healthy Addiction, Lady of Shamrock, Musique Toujours, Noble Court, Oil Man, Olympic Prospect, Tasha's Miracle, Taste of Paradise, Three Peat, Tizbud, Track Gal, Victory Encounter and Zappa.