The cheese when it was unveiled earlier in the year joined the burger that costs £3,000 from a restaurant in Las Vegas and a £700 caviar-coated omelette at a plush New York hotel as being one of the world's most expensive foods.
But unlike the posh US producers of the other foods the cheese now snapped up by the tennis ace is made on a donkey farm in Serbia, in Zasavica, that also provides the name of the company.
Slobodan Simic, the manager at Zasavica, said the secret of the cheese's great taste was the fact that it was produced from milk taken from donkey's raised on one of Serbia's most famous wildlife and nature reserves.
The cheese, known as pule, is made only from donkeys and it takes 25 litres of fresh donkey milk to make a single kilogram.