I'm going to stick to fights from my lifetime for now, even if there are some old ones I'd love to pick out, I prefer to go off fighters whose careers have followed live & how I can remember my reactions to them. I've probably answered the question more as a kind of 'which fight defined them' thing, but meh it's close enough.

Mosley-Margarito. I know that the temptation would be to pick the first Oscar fight or one of his defences at LW & WW, but he really was great in this fight. He even had a round where Margarito seemed to be getting back into it & he again imposed himself. This remains one of my best upset picks in years of watching the sport, even if truthfully it was partly pushed by memories of my childhood worship of Sugar Shane. The fact was it made him once again the real welterweight champion of the world.

Hopkins-Pavlik. Again I know the Tito one would be obvious, but this fight really had everyone thinking Hopkins was shot. He was supposed to just be there to make up the numbers. The question wasn't would Pavlik beat him, it was 'would Pavlik KO him?'. I know after damn near everyone claimed they'd picked 'Nard, but I didn't see a lot of them pre-fight. Also that moment where he stared out into press row might just be my most spine-tingling moment in watching the sport. It also had a truly brilliant moment where Hopkins threw a bolo punch, landed, Pavlik stayed in covered up & Hopkins gave him a look that said 'C'mon son, give me SOMETHING'.

Mayweather-Corrales. A tough one to pick out as there are so many fights that could be Floyd's 'best night'. The fight with Genaro, in which he was amazingly a major underdog, could definitely be it, but this was probably the single most dominant performance between two top fighters in my lifetime. It was more of a shut-out than any other fight between two elite guys (& they both were at the time) than any other.

Pacquiao-Hatton. I may be a bit biased here as I was at the fight, but I believe this was Pacquiao at his perfect weight & regardless of how badly Hatton fought, if he'd even been at his best, I struggle to believe he would have lasted much longer. Awe-inspiring to have even been in the presence of greatness.

Corrales-Castillo 1. I don't need to say anymore really. If ever there was a fight that defined one man refusing on every level to be beat, it was this one.