Thanks for the insight on him PMK...he was a little before my time.
May he RIP...not the nicest way to go.
Here is the short version. Skoff was more known for his loathing of Muster and vice versa. Austria never had any good tennis players, then Muster and Skoff came through at the same time.
They played Davis Cup together and got Austria's best ever result in 1990 and hardly spoke to each other. Skoff had the natural talent that Muster didn't, whereas Muster had the work ethic that Skoff didn't.
Best result besides his 4 IS titles were a finalist in Monte Carlo losing to Lendl. He liked the party life and loved his food, because he had a stocky physique, once he stopped training, he got really fat and this helped the heart attack for sure.