I know a veternarian who says that anyone who has a big cat as a pet is a few bricks shy of a full load. I tend to agree. I'm hoping that he was merely visiting a zoo and that the tiger or tigers are not his.
A tiger is a wild animal, and no 'amateur' should keep them as a pet - in a lot of countries it is even prohibited to keep wild animals as pets, and with good reason.
I'm sure he was just visiting a zoo, as you have to be a professional to keep those animals, and hey, I might be wrong, but I think he has a profession as a tennis player already...