The Boston Celtics had an exhilarating start to Summer League Sunday afternoon, as they overcame some early shooting struggles to sneak past the Atlanta Hawks with an 85-83 win in Las Vegas. The Celtics missed their first eight field-goal attempts of the game, which enabled Atlanta to get off to a 10-0 start. However, Boston found its rhythm midway through the first quarter, turning the game around with a 17-2 run.