I don't think some of those fights were that tough. Would have to revisit some, but after the first 4 rounds against Judah, that fight was dominated by Floyd. Corley got in a good round, but never posed a threat besides that. I don't remember Vargas being that close of a fight either, if I recall right, Floyd dropped him with a body shot.

The top two IMO, was obviously Castillo 1, and I would have to say Burton. Burton didn't pose a great threat, but Floyd had a long layoff, and the ringrust showed.Burton was always in his face, and busted Floyd's nose. Floyd had to fight.

After those, Oscar was tough, but part of Floyd's gameplan was to weather the storm early, and take over when Oscar started to fade, but was still a tough fight. Castillo 2, was tough, but not like the first, Floyd knew exactly what he needed to do to win, and Castillo couldn't stop it. Castillo still made it tough though. Chavez gets a honorable mention, because he gave it his all, but we saw what happened. After those four or five, you could put in about any fight of Floyd's to make a list of ten. The reason being, most of his fights weren't that tough, IMO.