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

### Instruction:
What was the Surface for the Partner of Jürgen Melzer, and a Date of July 16, 2011?

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

### Response:
SELECT Surface FROM table WHERE Partner = jürgen melzer AND Date = july 16, 2011