user: Question: What is the Date of the match with Opponent in the final of Filip Polášek?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['11 May 2003', 'Sidi Fredj', 'Clay', 'Sasa Tuksar', '6–4, 6–2']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent in the final" = 'Filip Polášek';