user: Question: Name the surface for score of 7–6(4), 6–1
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['September 12, 1993', 'Varna , Bulgaria', 'Clay', 'Antoaneta Pandjerova', '6–2, 3–6, 6–2']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Score" = '7–6(4), 6–1';