| Mary Lou Piatek-Daniels | |
| Residence: | Munster, Indiana |
| Birth Date: | 6 August 1961 |
| Birth Place: | Whiting, Indiana, U.S. |
| Turnedpro: | October 1, 1980 |
| Plays: | Right-handed |
| Careerprizemoney: | US$711,131 |
| Singlesrecord: | 152–214 |
| Singlestitles: | 2 |
| Highestsinglesranking: | No. 15 (March,1982) |
| Doublesrecord: | 233–214 |
| Doublestitles: | 7 |
| Highestdoublesranking: | 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.[1]
| Legend | ||
|---|---|---|
| Grand Slam | 0 | |
| WTA Championships | 0 | |
| Tier I | 0 | |
| Tier II | 0 | |
| Tier III | 0 | |
| Tier IV & V | 0 | |
| Result | W/L | Date | Tournament | Surface | Opponent | Score | |
|---|---|---|---|---|---|---|---|
| Loss | 1. | Jul 1980 | Richmond, Virginia, US | Carpet |  Martina Navratilova | 3–6, 0–6 | |
| Win | 2. | Aug 1981 | Richmond, Virginia, US | Carpet |  Sue Barker | 6–4, 6–1 | |
| Loss | 3. | Sep 1981 | Atlanta, Georgia, US | Carpet | Tracy Austin | 6–4, 3–6, 3–6 | |
| Win | 4. | Jan 1984 | Denver, Colorado, US | Hard | Kim Sands | 6–1, 6–1 |
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| Result | W/L | Date | Tournament | Surface | Partner | Opponents | Score | |
|---|---|---|---|---|---|---|---|---|
| Loss | 1. | Dec 1980 | Tucson, Arizona, US | Carpet | Wendy White | Leslie Allen Barbara Potter | 6–7, 0–6 | |
| Loss | 2. | Feb 1981 | Houston, Texas, US | Carpet | Regina Maršíková | Sue Barker Ann Kiyomura | 7–5, 4–6, 3–6 | |
| Win | 3. | Oct 1981 | Deerfield Beach, Florida, US | Hard | Wendy White | Pam Shriver Paula Smith | 6–1, 3–6, 7–5 | |
| Loss | 4. | Feb 1982 | Kansas City, Missouri, US | Carpet | Anne Smith | Barbara Potter Sharon Walsh | 6–4, 2–6, 2–6 | |
| Loss | 5. | Oct 1982 | Tampa, Florida, US | Hard | Wendy White | Ann Kiyomura Paula Smith | 2–6, 4–6 | |
| Win | 6. | Jan 1983 | Marco Island, Florida, US | Clay | Andrea Jaeger | Rosie Casals  Wendy Turnbull | 7–5, 6–4 | |
| Loss | 7. | Nov 1983 | Deerfield Beach, Florida, US | Hard | Pam Casale | Bonnie Gadusek Wendy White | 1–6, 6–3, 3–6 | |
| Loss | 8. | Jan 1984 | Nashville, Tennessee, US | Hard | Paula Smith | Sherry Acker Candy Reynolds | 7–5, 6–7, 6–7 | |
| Loss | 9. | Mar 1984 | Boston, Massachusetts, US | Carpet | Andrea Leand | Barbara Potter Sharon Walsh | 6–7, 0–6 | |
| Loss | 10. | Oct 1984 | Tarpon Springs, Florida, US | Hard | Wendy White |  Carling Bassett Liz Smylie | 4–6, 3–6 | |
| Win | 11. | Jan 1985 | Denver, Colorado, US | Carpet | Robin White | Leslie Allen Sharon Walsh | 1–6, 6–4, 7–5 | |
| Loss | 12. | Sep 1985 | New Orleans, Louisiana, US | Carpet | Anne White | Chris Evert-Lloyd Wendy Turnbull | 1–6, 2–6 | |
| Win | 13. | Oct 1985 | Indianapolis, Indiana, US | Hard | Bonnie Gadusek | Penny Barg Sandy Collins | 6–1, 6–0 | |
| Loss | 14. | Mar 1987 | Phoenix, Arizona, US | Hard | Anne White | Penny Barg Beth Herr | 6–2, 2–6, 6–7 | |
| Win | 15. | Mar 1987 | Dallas, Texas, US | Carpet | Anne White | Elise Burgin Robin White | 7–5, 6–3 | |
| Win | 16. | Nov 1987 | Little Rock, Arkansas, US | Hard | Robin White | Lea Antonoplis Barbara Gerken | 6–2, 6–4 | |
| Loss | 17. | Apr 1989 | Hilton Head, South Carolina, US | Clay | Wendy White | Hana Mandlíková Martina Navratilova | 4–6, 1–6 | |
| Loss | 18. | Feb 1990 | Hilton Head, South Carolina, US | Clay | Wendy White | Manon Bollegraf Meredith McGrath | 0–6, 2–6 | |
| Win | 19. | Feb 1990 | Oklahoma City, Oklahoma, US | Hard | Wendy White | Manon Bollegraf Lise Gregory | 7–5, 7–2 | |
| Loss | 20. | Apr 1991 | Hilton Head, South Carolina, US | Clay | Lise Gregory | Claudia Kohde-Kilsch Natalia Zvereva | 4–6, 0–6 | |
| Loss | 21. | Nov 1991 | Indianapolis, Indiana, US | Hard | Sandy Collins | Katrina Adams Elna Reinach | 7–5, 2–6, 4–6 |