CREATE TABLE table_name_4 (date VARCHAR2, score VARCHAR2, opponent VARCHAR2)

What date was the match against leonardo tavares with a score of 6 4, 6 4?
SELECT date FROM table_name_4 WHERE score = "6–4, 6–4" AND opponent = "leonardo tavares"
SELECT "date" FROM "table_name_4" WHERE "6–4, 6–4" = "score" AND "leonardo tavares" = "opponent"