Which opponent used a grass surface?
CREATE TABLE table_name_1 (opponent VARCHAR, surface VARCHAR)
SELECT opponent FROM table_name_1 WHERE surface = "grass"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_1 (opponent VARCHAR, surface VARCHAR) Question: Which opponent used a grass surface? [/INST] SELECT opponent FROM table_name_1 WHERE surface = "grass" </s>