Nadal Tennis ball

Someone out there is on to something special or is really ripping people off, the seller in question (no Names yet) claims that they have 20 tennis balls all signed by Nadal and Federer the greats themselves, which have appeared in all the matches that two have played against each other.

Each ball is being sold for £50 plus and will be around eBay for the next two weeks, the signatures look pretty real but im not so sure, 20 BALLS, is that even possible or have you pushed yourself to far with the lie.

Would you take punt on one of these balls or give them a miss.