user: Question: Name the opponents for May 18, 1997
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'July 30, 1989', 'Schenectady , New York, USA', 'Hard', 'Sandra Birch', 'Michelle Jaggard Hu Na', '3–6, 2–6']
SQL:

assistant: SELECT "Opponents" FROM "Table" WHERE "Date" = 'May 18, 1997';