Which Surface has an Opponent(s) of anna-lena grönefeld tatjana malek?
CREATE TABLE table_name_8 (surface VARCHAR, opponent_s_ VARCHAR)
SELECT surface FROM table_name_8 WHERE opponent_s_ = "anna-lena grönefeld tatjana malek"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_8 (surface VARCHAR, opponent_s_ VARCHAR) Question: Which Surface has an Opponent(s) of anna-lena grönefeld tatjana malek? [/INST] SELECT surface FROM table_name_8 WHERE opponent_s_ = "anna-lena grönefeld tatjana malek" </s>