user: Question: What was the Opponent in the Tarragona Tournament?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['9 August 2004', 'Cordenons', 'Clay', 'Daniel Köllerer', '4–6, 6–4, 6–3']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Tournament" = 'Tarragona';