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_21 (opponent VARCHAR, method VARCHAR, record VARCHAR)
### Question:
What was the name of the opponent when the method was ko (slam), and record was 13–1?
### Answer:
SELECT opponent FROM table_name_21 WHERE method = "ko (slam)" AND record = "13–1"