user: Question: In the surface of Clay who was the opponent in the game resulting in a score of 6–4, 6–4?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '8 April 2001', 'Athens , Greece', 'Clay', 'Elena Yaryshka', '7–5, 6–3']
SQL:

assistant: SELECT "Opponent in the final" FROM "Table" WHERE "Surface" = 'Clay' AND "Score" = '6–4, 6–4';