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_22091 ( "Edition" text, "Round" text, "Date" text, "Partnering" text, "Against" text, "Surface" text, "Opponents" text, "W\u2013L" text, "Result" text )

### Question ###
What country did Gil play against on 21 23 september 2007?

### Accurate SQL ###

SELECT "Against" FROM table_22091 WHERE "Date" = '21–23 September 2007'