CREATE TABLE table_12164707_1 (mens_doubles VARCHAR, womens_singles VARCHAR)

Who won the Men's Doubles when Karina de Wit won the Women's Singles?
SELECT mens_doubles FROM table_12164707_1 WHERE womens_singles = "Karina de Wit"
SELECT "mens_doubles" FROM "table_12164707_1" WHERE "Karina de Wit" = "womens_singles"