Jim Ryun....
Today, over 40 years after he set them, Ryun still holds the American junior (19 and under) records at 880 yd (1:44.9), 800 m (1:44.3), 1,500 m (3:36.1), and two miles (8:25.1). In all, he broke the American record for the mile four times: once as a high school senior (3:55.3 on 27 June 1965), twice as a college freshman (3:53.7 on 4 June 1966 & 3:51.3 on 17 July 1966), and once as a college sophomore (3:51.1 on 23 June 1967).
