WASHINGTON — Paul Pierce's banked-in 21-foot jumper at the buzzer gave the Washington Wizards a 103-101 victory over the Atlanta Hawks on Saturday night, even with an injured John Wall reduced to cheerleading, and after a 21-point lead had dwindled down to nothing. The Wizards lead the Eastern Conference semifinal series 2-1. Washington was missing Wall, its All-Star point guard, for a second consecutive game because of a broken left hand, but it was the Hawks who seemed out of sorts most of the evening.