Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17120964_9 (opponent VARCHAR, date VARCHAR)

### Question ###
who was the opponent where the date was the 21st?

### Accurate SQL ###

SELECT opponent FROM table_17120964_9 WHERE date = "21st"