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

### Instruction:
In the surface of clay who was the opponent in the game resulting in a score of 6–4, 6–4?

### Inputs:
table_name: table, columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']

### Response:
SELECT Opponent in the final FROM table WHERE Surface = clay AND Score = 6–4, 6–4