user: Question: What is the surface of the score, 7–6 (7–3) , 6–3?
Columns: ['Outcome', 'Date', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '25 July 2010', 'Clay', 'Timea Bacsinszky', '6–1, 6–4']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Score" = '7–6 (7–3) , 6–3';