CREATE TABLE table_74250 ("Date/Location" TEXT, "Mens singles" TEXT, "Womens Singles" TEXT, "U21 Mens" TEXT, "U21 Womens" TEXT, "Mixed Restricted" TEXT, "Mixed Veteran" TEXT)

Who was the U21 Mens winner when Mike Marsden was the mixed restricted winner and Claire Nelson was the U21 Womens winner?
SELECT "U21 Mens" FROM table_74250 WHERE "Mixed Restricted" = 'Mike Marsden' AND "U21 Womens" = 'Claire Nelson'
SELECT "U21 Mens" FROM "table_74250" WHERE "Mixed Restricted" = 'Mike Marsden' AND "U21 Womens" = 'Claire Nelson'