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

### Instruction:
Which Round has a Nationality of united states, and a Player of jimmy hayes?

### Inputs:
table_name: table, columns: ['Round', 'Pick', 'Player', 'Position', 'Nationality', 'Club Team']

### Response:
SELECT MAX Round FROM table WHERE Nationality = united states AND Player = jimmy hayes