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_31 (round VARCHAR, ranking VARCHAR)
### Question:
Which Round has a Ranking of 2008 wta tour?
### Answer:
SELECT round FROM table_name_31 WHERE ranking = "2008 wta tour"