On what surface was the game played with a score of 6 4, 6 4?
CREATE TABLE table_177273_2 (
    surface VARCHAR,
    score VARCHAR
)
SELECT surface FROM table_177273_2 WHERE score = "6–4, 6–4"
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: On what surface was the game played with a score of 6 4, 6 4? ### Input: CREATE TABLE table_177273_2 (
    surface VARCHAR,
    score VARCHAR
) ### Response: SELECT surface FROM table_177273_2 WHERE score = "6–4, 6–4"