Who was the U21 Mens winner when Mike Marsden was the mixed restricted winner and Claire Nelson was the U21 Womens winner? 
CREATE TABLE table_28211674_3 (u21_mens VARCHAR, mixed_restricted VARCHAR, u21_womens VARCHAR)
SELECT u21_mens FROM table_28211674_3 WHERE mixed_restricted = "Mike Marsden" AND u21_womens = "Claire Nelson"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28211674_3 (u21_mens VARCHAR, mixed_restricted VARCHAR, u21_womens VARCHAR) Question: Who was the U21 Mens winner when Mike Marsden was the mixed restricted winner and Claire Nelson was the U21 Womens winner?  [/INST] SELECT u21_mens FROM table_28211674_3 WHERE mixed_restricted = "Mike Marsden" AND u21_womens = "Claire Nelson" </s>