Nick Delpopolo: US judo star adopted from orphanage also 'fighting for Montenegro'
16 July 2012 Last updated at 01:52 BST
Born in Belgrade, Nick Delpopolo spent the first 21 months of his life in a crowded, crumbling Montenegro orphanage.
Then, he was adopted by a couple from New Jersey and moved to the US. Now he's ranked number 1 in the US and number 16 internationally in Judo.
Nick has returned to the land of his birth and visited the orphanage.
He says that although he will be wearing an American uniform when he fights in London, he feels like he is also representing Montenegro and the children who have not had the same opportunities as him.
Produced for the BBC by Anna Bressanin and Ilya Shnitser.