user: Question: What surface was the Australian Open (1) played on?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Opponent', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 2007.0, 'US Open (1)', 'Hard', 'Roger Federer', '6–7 (4–7) , 6–7 (2–7) , 4–6']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Championship" = 'Australian Open (1)';