user: Question: On what surface did Katarina Srebotnik play Paola Suárez?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Opponent in Final', 'Score in Final']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 'April 11, 1999', 'Estoril , Portugal', 'Clay', 'Rita Kuti-Kis', '6–3, 6–1']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Opponent in Final" = 'Paola Suárez';