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 11.07 in Mexico City, Mexico on October 15, 1968. It stood 21 months, until Chi Cheng's 11.0 on July 18, 1970. Wiki link