From this list of undefeated fighters, who is the best and the worst for you?

[Panadzzz]

1.floyd mayweather (i concluded him because i believe he would still return in the ring and challenge hoya again,or pac.)
2.joe calzaghe
3.kelly pavlik
4.joan guzman
5.edwin valero
6.jorge linares
7.chris john
8.chad dawson
9.julio cesar chavez jr.
10.andre berto

who is the best and worst for you? (your #1 and #10?)

Not a bad list but i think Edwin Valero and Julio Cesar Chavez Jr should be at the bottom. Chris John should be a tad higher, Chad Dawson should be one of the top fighters. And Andre Berto should move up a couple of places.

btw, my list is in no particular order, you, my friends decide who is the best and the worst, it's just a selection of fighters.
So dawson for you is the best and as for the worst, a tie bet. valero and jcc jr.