Whats the greatest losing performance you have ever seen? Not a controversial loss, a bout when you know said boxer has been beaten but has gained a great deal from that loss...reputation, etc...allowing said boxer to go on to greater fights despite the loss. :good
Recently Yuri Foreman's loss against Cotto. Not the greatest ever, but it earned him a lot of respect.
Not the greatest but Malinagi made his name off a loss and since then has got numerous paydays because of it!