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North Carolina A&T's Randolph Ross wins the men's 400 meters during the NCAA Division I Outdoor Track and Field Championships, Friday, June 11, 2021, at Hayward Field in Eugene, Ore. (AP Photo/Thomas Boyd) AP

Back-to-back NCAA champion Randolph Ross was booted from the world track and field championships on the eve of his 400 meter preliminary race, about a month after officials could not locate him to take an antidoping test.