Petra Kamstra
Petra Kamstra is a former professional tennis player from the Netherlands, who won one WTA-title in doubles during her career. She reached her individual career-high singles ranking on 2 October 1995, when Kamstra became the number 70 of the world. Twice she was named the Rotterdam Sportswoman of the Year.
WTA Tour finals
Doubles 1 (1–0)
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents | Score |
| Winner | 1. | 8 October 1995 | Surabaya, Indonesia | Hard |  Tina Križan |  Nana Miyagi  Stephanie Reece | 2–6, 6–4, 6–1 |
ITF finals
Singles Finals (2-4)
| Outcome | No. | Date | Tournament | Surface | Opponent in the final | Score in the final |
| Winner | 1. | 17 July 1989 | Koksijde, Belgium | Clay |  Heleen van den Berg | 7–5, 7–5 |
| Runner-up | 2. | 15 10 1990 | Madeira, Portugal | Hard |  Sabine Gerke | 1–6, 1–6 |
| Winner | 3. | 22 October 1990 | Benin City, Nigeria | Hard |  Sarah Bentley | 6–0, 7–5 |
| Runner-up | 4. | 24 May 1993 | Brindisi, Italy | Clay |  Irina Spîrlea | 1–6, 7–5, 3–6 |
| Runner-up | 5. | 7 June 1993 | Le Havre, France | Clay |  Ludmila Richterová | 7–6, 3–6, 4–6 |
| Runner-up | 6. | 14 August 1995 | Carthage, Tunisia | Clay |  María Fernanda Landa | 2–3 ret. |