user: Question: What is the 1st prize at the U.S. Open?
Columns: ['Date', 'Tournament', 'Location', 'Winner', 'Score', '1st prize ( $ )']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Jan 12', 'Phoenix Open', 'Arizona', 'Johnny Miller (12)', '260 (–24)', '30,000']
SQL:

assistant: SELECT "1st prize ( $ )" FROM "Table" WHERE "Tournament" = 'U.S. Open';