user: Question: Who played on a Hard surface?
Columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Winner', '27 September 2004', 'Benevento , Italy', 'Hard', 'Giulia Gabba', 'Martina Babáková Sandra Záhlavová', '6–2, 0–1 ret.']
SQL:

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