I think that they don't want to give there opponent a full score... But it's the same with Martina: If she loses she blames it on an injury.... Those world-class players just can't handle a loss against players who are outside the top20.
A man may fight for many things. His country, his friends, his principles, the glistening ear on the cheek of a golden child. But personally, I'd mud-wrestle my own mother for a ton of cash, an amusing clock and a sack of French porn.