Russian tennis star Maria Sharapova recalled how tough it was for her to write her book, Unstoppable: My life So Far. "I wrote my book for three years. It was hard work.

I probably read half of the Russian part. Opening up in a book is so tough. The most difficult thing was to write on my childhood. I spent a lot of time with my father [Yuri]. "However, when we moved to America, I was still young and I did not remember everything. But my father remembered everything and he was telling it in his own words. It was very interesting for me," Sharapova told Tennis World USA.