user: Question: What is the surface when the partner was Robert Haybittel?
Columns: ['Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['20 March 2006', 'Australia F4', 'Clay', 'Robert Haybittel', 'Damian Patriarca Joseph Sirianni', '6–7(4), 1–6']
SQL:

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