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

### Instruction:
How many athletes were named federico muller?

### Inputs:
table_name: table, columns: ['Athlete', 'Event', 'Elimination Poule', 'Round of 16', 'Quarterfinals', 'Semifinals', 'Final']

### Response:
SELECT COUNT Quarterfinals FROM table WHERE Athlete = Federico Muller