I always wondered why there wasn't any negotiations!

Maybe because Floyds spell at 140 was when Tszyu was having a lot of injury troubles?

Or was it that Tszyu battered uncle Roger for 12 rounds and he didn't want Floyd facing him at that point in his career?

Personally I think that Floyd would have outpointed Tszyu, but at that time I would have gone for Tszyu as I hadn't realised just how good Mayweather was!