user: Question: What surface did Hayley Ericksen play on?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '10 September 2006', 'Hope Island , Australia', 'Hard', 'Lucia Gonzalez', 'Shona Lee Karolina Wlodarczak', '6-4, 7-6(2)']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Partner" = 'Hayley Ericksen';