CREATE TABLE table_68697 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent in the final" CLOB, "Score" CLOB)

Which surface was played during Curitiba tournament?
SELECT "Surface" FROM table_68697 WHERE "Tournament" = 'curitiba'
SELECT "Surface" FROM "table_68697" WHERE "Tournament" = 'curitiba'