Who was the opponent of the match in round sf with a result of 0-0?
CREATE TABLE table_name_97 (
    opponent VARCHAR,
    round VARCHAR,
    result VARCHAR
)
SELECT opponent FROM table_name_97 WHERE round = "sf" AND result = "0-0"
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: Who was the opponent of the match in round sf with a result of 0-0? ### Input: CREATE TABLE table_name_97 (
    opponent VARCHAR,
    round VARCHAR,
    result VARCHAR
) ### Response: SELECT opponent FROM table_name_97 WHERE round = "sf" AND result = "0-0"