What surface was used on may 13, 2007?
CREATE TABLE table_name_19 (surface VARCHAR, date VARCHAR)
SELECT surface FROM table_name_19 WHERE date = "may 13, 2007"
### Context: CREATE TABLE table_name_19 (surface VARCHAR, date VARCHAR) ### Question: What surface was used on may 13, 2007? ### Answer: SELECT surface FROM table_name_19 WHERE date = "may 13, 2007"