The late Bart Giamatti, far too briefly the commissioner of baseball, understood the essence of his sport better than most people. ``It breaks your heart,'' he wrote. ``It is meant to break your heart.'' ADVERTISEMENT There is evidence of that every day but it was never more convincing than 43 years ago Sunday when Harvey Haddix pitched the greatest game ever and wound up with nothing more to show for it than another loss. There have been 16 perfect games pitched in baseball history, each of them discussed in James Buckley Jr.'s new book, ``Perfect.'' The roster includes Hall of...