CREATE TABLE table_35381 ("Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partnering" CLOB, "Opponents" CLOB, "Score" CLOB)

Date of april 10, 2006 had what surface?
SELECT "Surface" FROM table_35381 WHERE "Date" = 'april 10, 2006'
SELECT "Surface" FROM "table_35381" WHERE "Date" = 'april 10, 2006'