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

### Instruction:
How many Mixed Doubles won when Oliver Pongratz won the Men's Singles?

### Inputs:
table_name: table, columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']

### Response:
SELECT COUNT Mixed doubles FROM table WHERE Mens singles = Oliver Pongratz