user: Question: Name the surface for Australian Open for Winner
Columns: ['Outcome', 'Year', 'Championship', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', 1968.0, 'Australian Championships', 'Grass', 'Karen Krantzcke', 'Judy Tegart Dalton Lesley Turner Bowrey', '6–4, 3–6, 6–2']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Championship" = 'Australian Open' AND "Outcome" = 'Winner';