What is the tournament with a hard surface and Ruben de Kleijn as the opponent?
CREATE TABLE table_name_64 (tournament VARCHAR, surface VARCHAR, opponent VARCHAR)
SELECT tournament FROM table_name_64 WHERE surface = "hard" AND opponent = "ruben de kleijn"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_64 (tournament VARCHAR, surface VARCHAR, opponent VARCHAR) Question: What is the tournament with a hard surface and Ruben de Kleijn as the opponent? [/INST] SELECT tournament FROM table_name_64 WHERE surface = "hard" AND opponent = "ruben de kleijn" </s>