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Treniere Moser beats Mary Cain, right, to the
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Treniere Moser beats Mary Cain, right, to the finish line in the senior women's 1,500-meter run final at the U.S. Championships athletics meet in Des Moines, Iowa. (June 22, 2013)(Credit: AP)

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Mary Cain, Bronxville track phenom

Mary Cain, who attends Bronxville High School, is not only the country's top high school middle-distance runner, some observers are calling her the best U.S. runner to come along in decades. She holds several U.S. high school and junior records, including in the indoor mile (4:28.25) and 1,500-meter runs both indoors (4:11.72) and outdoors (4:04.62).