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_57 (opponent VARCHAR, score VARCHAR, tournament VARCHAR)
### Question:
What is the Opponent of the Banja Luka Tournament with a Score of 4–6, 4–6?
### Answer:
SELECT opponent FROM table_name_57 WHERE score = "4–6, 4–6" AND tournament = "banja luka"