Which has a Score of 6 1, 3 0 ret.?
CREATE TABLE table_name_45 (
    surface VARCHAR,
    score VARCHAR
)
SELECT surface FROM table_name_45 WHERE score = "6–1, 3–0 ret."
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: Which has a Score of 6 1, 3 0 ret.? ### Input: CREATE TABLE table_name_45 (
    surface VARCHAR,
    score VARCHAR
) ### Response: SELECT surface FROM table_name_45 WHERE score = "6–1, 3–0 ret."