user: Question: Who is the opponent for the Winner outcome on a Hard surface on August 27, 2011?
Columns: ['Outcome', 'Date', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'August 5, 2007', 'Hard', 'Andy Roddick', '4–6, 6–7 (4–7)']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Outcome" = 'Winner' AND "Surface" = 'Hard' AND "Date" = 'August 27, 2011';