What was the surface of the match against bethanie mattek-sands?
CREATE TABLE table_name_83 (surface VARCHAR, opponent VARCHAR)
SELECT surface FROM table_name_83 WHERE opponent = "bethanie mattek-sands"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_83 (surface VARCHAR, opponent VARCHAR) Question: What was the surface of the match against bethanie mattek-sands? [/INST] SELECT surface FROM table_name_83 WHERE opponent = "bethanie mattek-sands" </s>