Kathleen Horvath
Erica Kathleen "Kathy" Horvath is a retired American professional tennis player.
Career
She was the youngest player to play in the US Open in 1979 at 14 years and five days — this record still stands. Horvath was the youngest player to win the U.S. National 16 and under in 1979. She also is the only player to ever win all four age groups in the U.S. Girls Clay Courts in all consecutive years.Horvath played on the WTA Tour from 1981 to 1989, winning six singles titles and reaching a career-high ranking of world No. 10 in 1984. She reached the quarterfinals at the French Open in 1983 and 1984. She retired with a 176–154 singles record.
Horvath was the only player to defeat Martina Navratilova in the 1983 season, winning in the fourth round in three sets. Navratilova's coaches argued in the stands over strategy, something Navratilova noticed during the match.
Horvath had career victories over Navratilova, Andrea Jaeger, Manuela Maleeva, Gabriela Sabatini, Dianne Fromholtz, Claudia Kohde-Kilsch, Mary Joe Fernández, Betty Stöve, and Sylvia Hanika. She was a member of the 1984 United States Fed Cup team. Horvath played in the 1984 Olympics when tennis was reintroduced as a demonstration sport and was the first seed. She was coached by Harry Hopman and Nick Bollettieri.
After her tennis career, she got her BS and MBA at the Wharton School of Business and then worked on Wall Street until 2003.
WTA career finals
Singles 9: (6–3)
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
| Winner | 1. | 25 January 1981 | Montreal | Carpet |  Candy Reynolds | 6–4, 7–6 |
| Winner | 2. | 6 March 1983 | Nashville | Carpet |  Marcela Skuherská | 6–4, 6–3 |
| Runner-up | 1. | 23 May 1983 | Berlin | Clay | Chris Evert-Lloyd | 4–6, 6–7 |
| Winner | 3. | 13 November 1983 | Honolulu | Carpet |  Carling Bassett | 4–6, 6–2, 7–6 |
| Runner-up | 2. | 29 January 1984 | Marco Island | Clay | Bonnie Gadusek | 6–3, 0–6, 4–6 |
| Runner-up | 3. | 20 May 1984 | Berlin | Clay |  Claudia Kohde-Kilsch | 6–7, 1–6 |
| Winner | 4. | 10 March 1985 | Indianapolis | Carpet | Elise Burgin | 6–2, 6–4 |
| Winner | 5. | 31 March 1985 | Palm Beach Gardens | Clay |  Petra Jauch-Delhees | 3–6, 6–3, 6–3 |
| Winner | 6. | 12 July 1987 | Knokke | Clay | Bettina Bunge | 6–1, 7–6 |
Doubles 9: (3–6)
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents | Score |
| Winner | 1. | 9 May 1982 | Perugia | Clay |  Yvonne Vermaak | Billie Jean King Ilana Kloss | 2–6, 6–4, 7–6 |
| Winner | 2. | 7 August 1983 | Indianapolis | Clay |  Virginia Ruzici | Gigi Fernández Beth Herr | 4–6, 7–6, 6–2 |
| Runner-up | 1. | 20 May 1984 | Berlin | Clay | Virginia Ruzici |  Anne Hobbs Candy Reynolds | 3–6, 6–4, 6–7 |
| Runner-up | 2. | 27 May 1984 | Perugia | Clay | Virginia Ruzici | Iva Budařová Helena Suková | 6–7, 6–1, 4–6 |
| Winner | 3. | 10 March 1985 | Indianapolis | Carpet | Elise Burgin | Jennifer Mundel Molly Van Nostrand | 6–4, 6–1 |
| Runner-up | 3. | 28 April 1985 | Orlando | Clay | Elise Burgin | Martina Navratilova Pam Shriver | 3–6, 1–6 |
| Runner-up | 4. | 24 May 1987 | Strasbourg | Clay |  Marcella Mesker | Jana Novotná  Catherine Suire | 0–6, 2–6 |
| Runner-up | 5. | 12 July 1987 | Knokke | Clay | Marcella Mesker | Bettina Bunge  Manuela Maleeva | 6–4, 4–6, 4–6 |
| Runner-up | 6. | 5 October 1987 | Athens | Clay | Dinky Van Rensburg | Andrea Betzner  Judith Wiesner | 4–6, 6–7 |
Grand Slam singles performance timeline
| Tournament | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | Career SR |
| Australian Open | A | A | A | A | A | A | A | NH | A | A | 1R | 0 / 1 |
| French Open | A | 2R | 3R | 3R | QF | QF | 3R | 1R | 1R | 1R | A | 0 / 9 |
| Wimbledon | A | A | A | 1R | A | 2R | A | 3R | 1R | 1R | A | 0 / 5 |
| US Open | 2R | 2R | 3R | A | 2R | 1R | 1R | 3R | 1R | A | A | 0 / 8 |
| SR | 0 / 1 | 0 / 2 | 0 / 2 | 0 / 2 | 0 / 2 | 0 / 3 | 0 / 2 | 0 / 3 | 0 / 3 | 0 / 2 | 0 / 1 | 0 / 23 |
| Year-end ranking | NR | NR | 28 | 49 | 15 | 29 | 50 | 47 | 37 | 85 | 218 |