Wyomia Tyus is a retired American track and field sprinter, and the first person to retain the Olympic title in the 100 m. Wyomia Tyus (United States) set the women's 100 m world record of 11.1 in Mexico City, Mexico on April 21, 1968. It stood 4 months, until Lyudmila Samotyosova's 11.1 on August 15, 1968 (equalling it). Wiki link