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_37 (round INTEGER, winner VARCHAR)
### Question:
What is the average number of rounds for winner Rafael Cavalcante?
### Answer:
SELECT AVG(round) FROM table_name_37 WHERE winner = "rafael cavalcante"