Mallory was known for her endurance and baseline game, relying on a strong forehand and defense designed to tire her opponents. She moved to New York City in 1914 and won her first national title in 1915, defeating three-time winner Hazel Hotchkiss Wightman. She repeated her victory each year through 1918. After marrying Franklin Mallory in 1919, she again won the championship from 1920 through 1922 and for the last time in 1926. During this period she played some of the greatest women stars of the game, including Helen Wills Moody. She was elected to the International Tennis Hall of Fame in 1958.