user: Question: Which Surface has a Score in the final of 2–6, 6–7?
Columns: ['Outcome', 'Date', 'Championship', 'Surface', 'Opponent in the final', 'Score in the final']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 1986.0, 'Vienna , Austria', 'Hard (i)', 'Gary Donnelly', '2–6, 6–7']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Score in the final" = '2–6, 6–7';