user: Question: What is the opponent with the outcome of Runner-up with a date of 19 September 1994?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '23 April 1984', 'Taranto', 'Clay', 'Sabrina Goleš', '6–3, 7–5']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Outcome" = 'Runner-up' AND "Date" = '19 September 1994';