I have found interesting photos at this website:
http://nickstennispicks.com/2008/10/21/krajinovic-gets-chance-of-a-lifetime/
Krajinović gets chance of a lifetime
Not many people get an opportunity like NBTA student Filip Krajinović got a couple of weeks ago in California. Krajinović, 16, was in between two Challenger events in California when his manager at IMG set up a hit for him with tennis legend Pete Sampras. The young Serbian hit with Sampras for over two hours and he absolutely loved it.
