user: Question: Who is the opponent on November 22, 2009, Clay surface?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['March 27, 2006', 'Buenos Aires', 'Clay', 'Cristian Villagrán', '4–6, 6–3, 6–4']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Surface" = 'Clay' AND "Date" = 'November 22, 2009';