user: Question: What tournament had an opponent of Els Callens Nancy Feber?
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-ups', 'November 4, 1988', 'Melbourne , Australia ITF $10,000', 'Hard', 'Kristin Godridge', 'Natalia Leipus Bernadette Randall-Marshall', '4–6, 7–6 (7–5) , 2–6']
SQL:

assistant: SELECT "Tournament" FROM "Table" WHERE "Opponents in the final" = 'Els Callens Nancy Feber';