A man who won an auction to buy a plate from Andre Agassi and see a naked picture of the tennis great's wife said he is not sure the nude back in the photo belonged to Steffi Graf.
Agassi took part in the auction while he was in Taiwan earlier this month for an exhibition tennis match.
Standing on stage holding up the plate, Agassi said: "You pay more than 4,000 dollars, and I will show you a picture of my wife - on my phone - naked."
Franz Chen, chief executive of Taiwanese porcelain manufacturer Franz Collection, said he won the auction and, in exchange for the equivalent of 7,000 dollars, Agassi showed him a photo of the naked back of a blonde-haired woman.
Agassi won eight Grand Slam singles titles in his career, while Graf won 22. The two married in 2001 and have two children.