user: Question: What was the player's result at the U.S. Open of the player who finished 6th at the Open Ch?
Columns: ['Nationality', 'Player', 'Year', 'Wins', 'Masters', 'U.S. Open', 'Open Ch.', 'PGA Ch.']
Types: ['text', 'text', 'real', 'real', 'text', 'text', 'text', 'text']
Sample row: ['United States', 'Ed Dudley *', 1937.0, 0.0, '3rd', '5th', '6th', 'R16']
SQL:

assistant: SELECT "U.S. Open" FROM "Table" WHERE "Open Ch." = '6th';