Mary Cain is a professional American middle-distance runner from Bronxville, New York. She was the 2014 World Junior Champion in the 3000-meter event. Mary Cain is the youngest American athlete ever to represent the United States at a World Championships meet after competing in the 2013 World Championships in Athletics in Moscow aged 17 and 3 months.
Mary Cain was born in New York City in 1996. She ran for 10 seasons for Bronxville High School, winning numerous state titles, as well as two national titles while still a Bronxville athlete. In 2010, she was the NYS Class C Cross Country Champion; in 2011, she was both NYS Class C and NYS Federation Champion.
In 2013, Mary Cain finished 2nd at USA Outdoor Track and Field Championships on 1500m. The next year was the most successful for her, becoming a champion at USA Indoor Track and Field Championships on 1500m and second at USA Outdoor Track and Field Championships.
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