user: Question: Which country has is Len Mattiace in T10 place?
Columns: ['Place', 'Player', 'Country', 'Score', 'To par']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['T1', 'Brett Quigley', 'United States', 65.0, '–5']
SQL:

assistant: SELECT "Country" FROM "Table" WHERE "Place" = 'T10' AND "Player" = 'Len Mattiace';