CREATE TABLE table_43850 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

Who is the opponent for the game played on august 20, 2006?
SELECT "Opponent" FROM table_43850 WHERE "Date" = 'august 20, 2006'
SELECT "Opponent" FROM "table_43850" WHERE "Date" = 'august 20, 2006'