It's All Untrue: Lendl Spurns The Lendl Myth
LEAD: It hardly comes as a surprise that the house Ivan Lendl lives in is made of stone, great slabs of gray and beige stone, and is protected from the rest of the world by two fences: a natural baffle of hemlocks backed up by a no-nonsense span of chain link. Protecting himself - on the job with a dentist's drill of a forehand, at leisure with a battery of sarcasm that passes for cocktail-hour banter, at home with a meticulously trained quartet of brainy