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Ralph Serna (born January 10, 1957) is a former long-distance runner. He was one of the most prolific high school distance runners in the late 1970s when he competed with Loara High School from his hometown, Anaheim in California. During this time he joined the rivalry between a notable generation of California high school runners, including the likes of Eric Hulst and Thom Hunt. Serna went on to represent the United States at the IAAF World Cross Country Championships in 1975 and 1976, and also had a collegiate spell with University of California, Irvine.