What date was the match against leonardo tavares with a score of 6 4, 6 4?
CREATE TABLE table_name_4 (
    date VARCHAR,
    score VARCHAR,
    opponent VARCHAR
)
SELECT date FROM table_name_4 WHERE score = "6–4, 6–4" AND opponent = "leonardo tavares"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What date was the match against leonardo tavares with a score of 6 4, 6 4? ### Input: CREATE TABLE table_name_4 (
    date VARCHAR,
    score VARCHAR,
    opponent VARCHAR
) ### Response: SELECT date FROM table_name_4 WHERE score = "6–4, 6–4" AND opponent = "leonardo tavares"