user: Question: What date was the match against Leonardo Tavares with a score of 6–4, 6–4?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['30 July 2007', 'Tampere , Finland', 'Clay', 'Peter Luczak', '6–7 (4–7) , 6–4, 6–4']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Score" = '6–4, 6–4' AND "Opponent" = 'Leonardo Tavares';