CREATE TABLE table_5788 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partnering" TEXT, "Opponents in the final" TEXT, "Score" TEXT)

When has a Score of 6 3, 6 4?
SELECT "Date" FROM table_5788 WHERE "Score" = '6–3, 6–4'
SELECT "Date" FROM "table_5788" WHERE "Score" = '6–3, 6–4'