I came across the book by chance and went through a few pages automatically (a free sample on my Kindle), and then I was forced to buy it because I could not let go. I read it in two days and I loved it.
It's a beautiful story, both uplifting (his father is totally crazy), exciting and often moving.
Special mention to the scene of the meeting between the father and that of Agassi Steffi Graff: it's hilarious.