CREATE TABLE table_52750 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Which surface has a Date of 22 august 2006?
SELECT "Surface" FROM table_52750 WHERE "Date" = '22 august 2006'
SELECT "Surface" FROM "table_52750" WHERE "Date" = '22 august 2006'