user: Question: When has a Score of 6–3, 6–4?
Columns: ['Date', 'Tournament', 'Surface', 'Partnering', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['August 4, 1991', 'Kitzbühel , Austria', 'Clay', 'Tomás Carbonell', 'Pablo Arraya Dimitri Poliakov', '6–7, 6–2, 6–4']
SQL:

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