Save for some interviews with significant tennis players of the past, this was a really poor effort, and disappointingly so. I'm not sure what the aim of this book was, the author has his own crisis of what the book is halfway through, and it certainly hasn't stood the test of time (a mammoth 4 and a bit years).
As Mitchell explains halfway through, this started out as a year in the life at the top of tennis, and then he found a new story - the big 4 were on the decline, with a new group of players rising. When you look at Federer's results from that year, you can understand how he reached that conclusion, but it is demonstrably false. Written at the end of 2013, over 4 years later Federer has won the Australian Open in his mid-thirties and the chief complaint is of the dominance of the big 4. Essentially, the premise of his book is a load of nonsense, and the only player to emerge as a genuine challenger is Stan Wawrinka, who Mitchell practically writes off as a 28 year old who has got used to losing (though the final chapter mentions his first slam). The hot prospects he touts in Janowicz, Khachanov and Dimitrov have had mixed success, with only Dimitrov making a reasonable name for himself.
Ok, Mitchell isn't psychic, but so what? The problem is that this book simply isn't very revelatory or revealing. Any casual tennis fan knows the big 4 dominate, and that their relationships with each other are cordial in public. The problem is, Mitchell doesn't have much insider knowledge, or at least, hasn't felt confident enough to publish it. Virtually all comments are from outsiders or official press conferences, which can be interesting in some ways, but mundane or unreliable in most. One particular highlight was an interview with Mats Wilander who gave his balanced views on the modern game, but such insight was rare. This was made most apparent in the case of Marin Cilic, whose drugs test was kept under wraps and journalists could only go on official statements until his test result was revealed much later. You have to be careful about drawing too big a conclusion but this gave the strong impression of a world in which journalists were the people to deliver the official message, and not allowed into the inner sanctum with a wink and nudge.
There were other frequently annoying aspects too, the reports at the start of each chapter bore scant relevance to the text beneath and there was a little too much scoreboard repetition. This is necessary when discussing tennis but sticks out when much of the rest is filler too.
This would have been much better as an interview with Mats Wilander and assorted other features dotted through the year in the paper Mitchell writes for, because it's not a book. There's not an awful lot of tennis writing save the odd biography, and perhaps tennis is a game to be watched, not written about.