user: Question: What is the score of champion Ken Rosewall in 1957?
Columns: ['Year', 'Champion', 'Runner-up', 'Score', 'Surface']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Professional Era', 'Professional Era', 'Professional Era', 'Professional Era', 'Professional Era']
SQL:

assistant: SELECT "Score" FROM "Table" WHERE "Champion" = 'Ken Rosewall' AND "Year" = '1957';