user: Question: Who was the Opponent in the match with a Score of 6–3, 6–4?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'March 5, 2007', 'Spain F7, Cartagena , Spain', 'Clay', 'Adrián Menéndez-Maceiras', '3–6, 6–2, 6–4']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Score" = '6–3, 6–4';