user: Question: Which Score in the final has a Surface of Hard on August 20, 1989?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score in the final']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'October 4, 1987', 'San Francisco , USA', 'Carpet (i)', 'Glenn Layendecker', 'Jim Grabb Patrick McEnroe', '2–6, 6–0, 4–6']
SQL:

assistant: SELECT "Score in the final" FROM "Table" WHERE "Surface" = 'Hard' AND "Date" = 'August 20, 1989';