Question: When Naomi Owen won the Womens Singles and Ricardo Walther won the Mens Singles, who won the mixed veteran?
Schema: create table table_28211674_3 (mixed_veteran varchar, womens_singles varchar, mens_singles varchar, PRIMARY KEY (mixed_veteran))
SQL: select mixed_veteran from table_28211674_3 where womens_singles = "naomi owen" and mens_singles = "ricardo walther"