user: Question: Which Opponent has a Round of QF Replay?
Columns: ['Date', 'Round', 'Opponent', 'Venue', 'Result', 'Attendance', 'Scorers']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['4 January 2003', 'R3', 'Middlesbrough', 'H', '1-0', 2796.0, 'Stanić']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Round" = 'QF Replay';