I finished reading the Tignor book. Not sure why it's called "The Untold Story," when it's all secondary sources, and therefore very told. But I enjoyed reading it, those were the gang of players I grew up watching. Not that chapters on Connors, Nastase and Gerulaitus added anything to a book about the rivalry between Borg and Mac, taking up maybe two thirds of the book in the process, but I enjoyed those too. I suppose the publishers insisted on an exclusive title.
It kinda fizzled out a little in the end, and like I say, there's a better book to be written in this period of tennis, but it filled a gap nicely between the FO and Wimbo...