user: Question: What surface has Indian Wells as the championship, with Winner as the outcome?
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Opponent', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', 2000.0, 'Stuttgart', 'Hard (i)', 'Wayne Ferreira', '6–7 (6–8) , 6–3, 7–6 (7–5) , 6–7 (2–7) , 2–6']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Championship" = 'Indian Wells' AND "Outcome" = 'Winner';