Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What country did Gil play against on 21–23 september 2007?

### Inputs:
table_name: table, columns: ['Edition', 'Round', 'Date', 'Partnering', 'Against', 'Surface', 'Opponents', 'W–L', 'Result']

### Response:
SELECT Against FROM table WHERE Date = 21–23 September 2007