Paul Pierce hit the game-winning shot with 0.5 seconds left to spoil the Atlanta Hawks undefeated season, 103-102, on Wednesday night at the TD BankNorth Garden. Marvin Williams drained a three to put the Hawks up with just second left in the game before Pierce nailed a deep jumper from the corner. The Celtics captain finished the game with 34 points (8-14 FG, 15-16 FT).