user: Question: What is the Surface of the court against Ivo Klec with a Score of 6–3, 6–3?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 'August 11, 2003', 'Spain F16, Denia', 'Clay', 'José Antonio Sánchez-de Luna', '6–3, 6–2']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Opponent" = 'Ivo Klec' AND "Score" = '6–3, 6–3';