user: Question: What is Score, when Country is "United States", and when Player is "John Mahaffey"?
Columns: ['Place', 'Player', 'Country', 'Score', 'To par']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['T1', 'John Mahaffey', 'United States', '69-72=141', '–1']
SQL:

assistant: SELECT "Score" FROM "Table" WHERE "Country" = 'United States' AND "Player" = 'John Mahaffey';