I was told "it's not only for baseball fans", but I have to confirm that for me it was! Don't get me wrong, the content focussing on dedication and drive is great, but it all goes down to baseball games. Not my thing.
I used to teach statistics and econmetrics, I used to play baseball in France so I bought this book is for me :-). Like every others books of Michael Lewis, this one is very interesting. Easy to read even if you're not a statistician or a baseball player, this book is well documented. I've had pleasure to read it and learn lots of things. I recommend it to my students in master of finance.