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

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'