user: Question: What opponent in the final has Rockford, Illinois as the tournament?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['15 September 1996', 'Zadar', 'Clay', 'Magdalena Zděnovcová', '4–6, 6–3, 6–3']
SQL:

assistant: SELECT "Opponent in the final" FROM "Table" WHERE "Tournament" = 'Rockford, Illinois';