Mary Lou Piatek-Daniels
| Country (sports) | United States |
|---|---|
| Residence | Munster, Indiana |
| Born | August 6, 1961 Whiting, Indiana, U.S. |
| Height | 5 ft 6 in (1.68 m) |
| Turned pro | October 1, 1980 |
| Plays | Right-handed |
| Prize money | US$711,131 |
| Singles | |
| Career record | 152–214 |
| Career titles | 2 |
| Highest ranking | No. 15 (March,1982) |
| Doubles | |
| Career record | 233–214 |
| Career titles | 7 |
| Highest ranking | No. 24 (September 24, 1990) |
Mary Lou Piatek-Daniels (born August 6, 1961) 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.