CREATE TABLE table_43446 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score" TEXT)

Which Surface has an Opponent in the final of st phane robert?
SELECT "Surface" FROM table_43446 WHERE "Opponent in the final" = 'stéphane robert'
SELECT "Surface" FROM "table_43446" WHERE "Opponent in the final" = 'stéphane robert'