When Naomi Owen won the Womens Singles and Ricardo Walther won the Mens Singles, who won the mixed veteran?
CREATE TABLE table_28211674_3 (
    mixed_veteran VARCHAR,
    womens_singles VARCHAR,
    mens_singles VARCHAR
)
SELECT mixed_veteran FROM table_28211674_3 WHERE womens_singles = "Naomi Owen" AND mens_singles = "Ricardo Walther"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: When Naomi Owen won the Womens Singles and Ricardo Walther won the Mens Singles, who won the mixed veteran? ### Input: CREATE TABLE table_28211674_3 (
    mixed_veteran VARCHAR,
    womens_singles VARCHAR,
    mens_singles VARCHAR
) ### Response: SELECT mixed_veteran FROM table_28211674_3 WHERE womens_singles = "Naomi Owen" AND mens_singles = "Ricardo Walther"