user: Question: Who is the Opponent in the final after 1983 with an Outcome of Runner-up?
Columns: ['Outcome', 'Date', 'Championship', 'Surface', 'Opponent in the final', 'Score in the final']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 1979.0, 'Kitzbühel , Austria', 'Clay', 'Vitas Gerulaitis', '2–6, 2–6, 4–6']
SQL:

assistant: SELECT "Opponent in the final" FROM "Table" WHERE "Outcome" = 'Runner-up' AND "Date" > 1983.0;