user: Question: What is the surface of the match when the outcome was Runner-up, and a Score of Julia Görges Polona Hercog?
Columns: ['Outcome', 'Date', 'Surface', 'Opponent', 'Score']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Runner-up', '5 February 2007', 'Carpet (i)', 'Gabriela Navrátilová', 'Cara Black Liezel Huber']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Outcome" = 'Runner-up' AND "Score" = 'Julia Görges Polona Hercog';