user: Question: What is the Championship with Vitas Gerulaitis as Opponent in the final in a match on Clay Surface?
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 "Championship" FROM "Table" WHERE "Surface" = 'Clay' AND "Opponent in the final" = 'Vitas Gerulaitis';