user: Question: Who was the opponent in the math that was played in Nice on a Clay court?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '25 May 1987', 'Florence', 'Clay', 'Alessandro de Minicis', '6–1, 6–3']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Surface" = 'Clay' AND "Tournament" = 'Nice';