Mariaan de Swardt
Mariaan de Swardt is a former tennis player from South Africa, who played as a professional from 1988 to 2001. She twice represented her native country at the Summer Olympics, in 1992 and 1996, and was a member of the South Africa Fed Cup team in 1992 and 1994–1997. In 2006, De Swardt became a U.S. citizen.
De Swardt won two Grand Slam titles in mixed-doubles competition, the 1999 Australian Open and the 2000 French Open with partner David Adams.
She also holds four women's doubles titles and reached as high as world No. 11 in WTA women's doubles rankings. She has one WTA Tour singles title from 1998 and reached a career-high singles ranking of world No. 28 in 1996.
Since retiring from tennis, she has been a commentator for Eurosport and South African television, and she has coached at professional, collegiate and recreational level with her base being at Atlanta, Georgia. She now resides in Houston, Texas, and is a teaching professional at the River Oaks Country Club. In 2004, she set up a non-profit charity, the Pet Care Fund, to help animals.
Grand Slam finals
Doubles: 1 (1 runner-up)
Mixed doubles: 2 (2 titles)
WTA career finals
Singles: 1 (1–0)
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
| Winner | 1. | 16 August 1998 | Boston, United States | Hard |  Barbara Schett | 3–6, 7–6, 7–5 |
Doubles: 9 (4–5)
ITF finals
Singles (9–2)
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
| Winner | 1. | 1 December 1986 | Vereeniging, South Africa | Hard |  Marie-Christine Damas | 6–2, 6–4 |
| Winner | 2. | 11 January 1988 | Vereeniging, South Africa | Hard |  Linda Barnard | 6–2, 3–6, 6–4 |
| Runner-up | 1. | 18 January 1988 | Pretoria, South Africa | Hard | Elna Reinach | 3–6, 4–6 |
| Runner-up | 2. | 20 November 1989 | Tel Aviv, Israel | Clay |  Yael Segal | 3–6, 3–6 |
| Winner | 3. | 23 April 1990 | Ramat HaSharon, Israel | Hard |  Petra Thorén | 6–1, 6–4 |
| Winner | 4. | 28 May 1990 | Francavilla, Italy | Clay |  Zuzana Witzová | 6–7, 7–6, 6–2 |
| Winner | 5. | 4 June 1990 | Mantua, Italy | Hard |  Federica Bonsignori | 6–3, 6–7, 6–3 |
| Winner | 6. | 22 April 1991 | Ramat HaSharon, Israel | Hard | Ilana Berger | 6–3, 4–6, 6–2 |
| Winner | 7. | 6 May 1991 | Porto, Portugal | Clay |  Inés Gorrochategui | 6–1, 6–2 |
| Winner | 8. | 8 May 1994 | San Luis Potosí, Mexico | Hard |  Michelle Jackson-Nobrega | 6–3, 7–6 |
| Winner | 9. | 2 August 1998 | Salt Lake City, United States | Hard |  Kristina Brandi | 6–2, 6–2 |
Doubles (7–3)
Head-to-head records
- Anna Kournikova 1–0
- Martina Hingis 1–0
- Lindsay Davenport 2–0
- Venus Williams 1–0
- Steffi Graf 1–2
- Anke Huber 2–2
- Monica Seles 2–0
- Dominique Monami 1–2