Mary Lou Piatek-Daniels
Mary Lou Piatek-Daniels is a retired tennis player from the U.S. who played on the WTA Tour during the 1980s.
In 1979, she was the no. 1 junior in the world. She won her first pro title at Richmond, Virginia 1981, beating Sylvia Hanika and Sue Barker en route. She was coached by her father Joseph, a former varsity player at Indiana University, and by Trinity coach Emilie Foster.
Piatek-Daniels made her ranking debut in February 1980 at no. 45. Her career wins include Robin White, Christiane Jolissaint, Kathy Horvath, Wendy White, Gigi Fernández, and Betsy Nagelsen.
WTA Tour finals
Singles 4 (2–2)
| Result | W/L | Date | Tournament | Surface | Opponent | Score | |||||||||||||
| Loss | 0–1 | Jul 1980 | Richmond, Virginia, US | Carpet |  Doubles 21 (7–14)
|