If you like John Scalzi's 'Old Man's War' books or 'The Human Division' I think your will like this. It is a short story, (I read it on the Kindle for 38p in the UK at the time of writing). It concerns the things some of the characters have to do, to gain success on a diplomatic missions. In this case one of the character's has to fight (and lose) as a form of 'champion' for humanity a representative of the alien race. The story is imaginative, and like good short stories is great for a quick satisfying read.