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_69 (date VARCHAR, surface VARCHAR, partner VARCHAR)
### Question:
What day did he play on hard with tom mercer?
### Answer:
SELECT date FROM table_name_69 WHERE surface = "hard" AND partner = "tom mercer"