user: Question: What was the surface for the  opponents in the final with Fitzgerald Vilas?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Partner', 'Opponents in the final', 'Score in the final']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 2007.0, 'French Open', 'Clay', 'Järryd', 'Fitzgerald Vilas', '6–1, 6–2']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Opponents in the final" = 'Fitzgerald Vilas';