user: Question: What type of surface was played on July 27, 2013?
Columns: ['Date', 'Tournament', 'Surface', 'Partner', 'Opponents', 'Score']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['July 13, 2008', 'Granby , Canada', 'Hard', 'Philip Bester', 'Alberto Francis Nicholas Monroe', '2–6, 6–1, [10–5]']
SQL:

assistant: SELECT "Surface" FROM "Table" WHERE "Date" = 'July 27, 2013';