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

### Instruction:
When bas van erp was the athlete what was the quarterfinals?

### Inputs:
table_name: table, columns: ['Athlete', 'Class', 'Event', 'Round of 64', 'Round of 32', 'Round of 16', 'Quarterfinals', 'Semifinals', 'Final/ Bronze medal match']

### Response:
SELECT Quarterfinals FROM table WHERE Athlete = Bas van Erp