Mary Mairs competed at the 1964 Olympics, and with Kathy Kusner, was one of the first two American women to compete in show jumping at the Olympics. After marrying Frank Chapot she returned in 1968. Mairs-Chapot won three medals and two golds at the Pan American Games, winning golds in both individual and team jumping in 1963 and a team jumping silver in 1967. She rode Tomboy at the 1963 Pan Ams and 1964 Olympics, but was on White Lightning in 1967-68. With Tomboy Mairs-Chapot won the first US Grand Prix, in 1965. During her career she rode on 22 winning Nations’ Cup squads, including wins at Imperial Cup, John Player Cup, and Queen Elizabeth Cup in England, in addition to wins at Lucerne, Essen, Wiesbaden, and Ostend. She won the Grand Prix at The National Horse Show in 1966 and 1968, and in 1963 was named American Horse Shows Association Horsewoman of the Year and Los Angeles Times Woman of the Year.