CREATE TABLE table_13958 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Opponent in final" CLOB, "Score" CLOB, "Prize Money" CLOB)

What is the Surface of the Tournament on June 11, 2006?
SELECT "Surface" FROM table_13958 WHERE "Date" = 'june 11, 2006'
SELECT "Surface" FROM "table_13958" WHERE "Date" = 'june 11, 2006'