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 | Championship | Surface | Opponent in the final | Score in the final |
| --- | --- | --- | --- | --- | --- |
| Runner-up | 1979.0 | Kitzbühel , Austria | Clay | Vitas Gerulaitis | 2–6, 2–6, 4–6 |
| Winner | 1981.0 | Nancy , France | Hard (i) | Ilie Năstase | 6–2, 7–5 |
| Runner-up | 1983.0 | Delray Beach WCT , U.S. | Clay | Guillermo Vilas | 1–6, 4–6, 0–6 |
| Runner-up | 1984.0 | Vienna , Austria | Hard (i) | Tim Wilkison | 1–6, 1–6, 2–6 |
| Winner | 1985.0 | Kitzbühel , Austria | Clay | Michael Westphal | 7–5, 6–2 |
Question:
Who is the Opponent in the final after 1983 with an Outcome of runner-up?
Answer:
Tim Wilkison