user: Question: When Naomi Owen won the Womens Singles and Ricardo Walther won the Mens Singles, who won the mixed veteran?
Columns: ['Date/Location', 'Mens singles', 'Womens Singles', 'U21 Mens', 'U21 Womens', 'Mixed Restricted', 'Mixed Veteran']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['July 2010 Doncaster', 'Liam Pitchford', 'Kelly Sibley', 'Alim Hirji', 'Karina Le Fevre', 'Will Bayley', 'Abdul Wuraola']
SQL:

assistant: SELECT "Mixed Veteran" FROM "Table" WHERE "Womens Singles" = 'Naomi Owen' AND "Mens singles" = 'Ricardo Walther';