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

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'