CREATE TABLE table_17521 ("Year" FLOAT, "Mens singles" CLOB, "Womens singles" CLOB, "Mens doubles" CLOB, "Womens doubles" CLOB, "Mixed doubles" CLOB)

Who was the mens doubles when womens singles is mette s rensen?
SELECT "Mens doubles" FROM table_17521 WHERE "Womens singles" = 'Mette Sørensen'
SELECT "Mens doubles" FROM "table_17521" WHERE "Womens singles" = 'Mette Sørensen'