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

### Instruction:
What was the surface when the opponent was sergiy stakhovsky mikhail youzhny?

### Inputs:
table_name: table, columns: ['Outcome', 'Date', 'Surface', 'Partner', 'Opponents', 'Score']

### Response:
SELECT Surface FROM table WHERE Opponents = sergiy stakhovsky mikhail youzhny