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_51 (round VARCHAR, surface VARCHAR, opponent VARCHAR)
### Question:
What's Round has a Surface of hard and Opponent of Jelena Simic?
### Answer:
SELECT round FROM table_name_51 WHERE surface = "hard" AND opponent = "jelena simic"