user: Question: When is the earliest year in Milan that Guillermo Vilas was champion?
Columns: ['Location', 'Year', 'Champion', 'Runner-up', 'Score']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Milan', 2005.0, 'Robin Söderling', 'Radek Štěpánek', '6–3, 6–7 (2–7) , 7–6 (7–5)']
SQL:

assistant: SELECT MIN("Year") FROM "Table" WHERE "Location" = 'Milan' AND "Champion" = 'Guillermo Vilas';