user: Question: On which surface did Mathieu play against Antonio Veić?
Columns: ['Date', 'Tournament', 'Surface', 'Opponent in the Final', 'Score in the Final']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['9 August 2004', "L'Aquila , Italy", 'Clay', 'Andrey Golubev', '6–2, 6–1']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Opponent in the Final" = 'Antonio Veić';