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

### Instruction:
Which Runner-up has a Winning score of −20 (70-69-64-65=268)?

### Inputs:
table_name: table, columns: ['Date', 'Tournament', 'Winning score', 'Margin of victory', 'Runner-up']

### Response:
SELECT Runner-up FROM table WHERE Winning score = −20 (70-69-64-65=268)