Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_97 (opponent VARCHAR, round VARCHAR, result VARCHAR)
### Question:
Who was the opponent of the match in round sf with a result of 0-0?
### Answer:
SELECT opponent FROM table_name_97 WHERE round = "sf" AND result = "0-0"