Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Outcome | Date | Tournament | Surface | Opponent | Score |
| --- | --- | --- | --- | --- | --- |
| Winner | 14 February 1983 | Hershey | Carpet (I) | Sandy Collins | 2–6, 6–0, 6–4 |
| Runner-up | 28 February 1983 | Palm Springs | Hard | Yvonne Vermaak | 3–6, 5–7 |
| Runner-up | 11 April 1983 | Amelia Island | Clay | Chris Evert-Lloyd | 3–6, 6–2, 5–7 |
| Runner-up | 7 November 1983 | Honolulu | Carpet (I) | Kathy Horvath | 6–4, 2–6, 6–7(1) |
| Runner-up | 8 October 1984 | Tampa | Hard | Michelle Torres | 1–6, 6–7(4) |
| Winner | 18 May 1987 | Strasbourg | Clay | Sandra Cecchini | 6–3, 6–4 |
Question:
What outcome has yvonne vermaak as the opponent?
Answer:
Runner-up