John Brooks, a 21-year-old German American making his competitive debut for the United States who was on the field only because a starting fullback was hurt, powered a fierce header into the net in the 86th minute Monday night to lift the Americans over Ghana 2-1 in their World Cup opener. The United States’ John Brooks, right, heads the ball past Ghana goalkeeper Adam Kwarasey (12) in the 86th minute for the decisive goal.