The Heat and Celtics have met many times before, but never quite like this. On how Porzingis changes the shape of things, defensive wrinkles on both sides, the Heat's offense without Jimmy Butler and Miami's narrow, but clear, path to success. Preview: https://www.nba.com/heat/news/heat-celtics-preview-once-more-with-feeling-adebayo-herro-tatum-brown-porzingis