CREATE TABLE table_60685 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

What date was the match against leonardo tavares with a score of 6 4, 6 4?
SELECT "Date" FROM table_60685 WHERE "Score" = '6–4, 6–4' AND "Opponent" = 'leonardo tavares'
SELECT "Date" FROM "table_60685" WHERE "Opponent" = 'leonardo tavares' AND "Score" = '6–4, 6–4'