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_15 (date VARCHAR, surface VARCHAR, score VARCHAR)
### Question:
What is the date of the match on clay with score of 6-3 2-6 6-4?
### Answer:
SELECT date FROM table_name_15 WHERE surface = "clay" AND score = "6-3 2-6 6-4"