What is the surface of the tournament with Sascha Kloer as the opponent?
CREATE TABLE table_name_37 (surface VARCHAR, opponent VARCHAR)
SELECT surface FROM table_name_37 WHERE opponent = "sascha kloer"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_37 (surface VARCHAR, opponent VARCHAR) Question: What is the surface of the tournament with Sascha Kloer as the opponent? [/INST] SELECT surface FROM table_name_37 WHERE opponent = "sascha kloer" </s>