What was the surface for the May 10, 2009 tournament?
CREATE TABLE table_name_91 (surface VARCHAR, date VARCHAR)
SELECT surface FROM table_name_91 WHERE date = "may 10, 2009"
### Context: CREATE TABLE table_name_91 (surface VARCHAR, date VARCHAR) ### Question: What was the surface for the May 10, 2009 tournament? ### Answer: SELECT surface FROM table_name_91 WHERE date = "may 10, 2009"