Rankings can be as subjective as your favorite color. Sometimes there's hard evidence; most of the time, because the best don't fight the best in this sport as much as we'd like, there's not. There are only six legitimate champions among the 17 weight classes in Wladimir Klitschko (heavyweight), Bernard Hopkins (light-heavyweight), Sergio Martinez (middleweight), Juan Manuel Marquez (lightweight), Pongsakkek Wonjongkam (flyweight) and Giovanni Segura (junior-flyweight).
Marquez fought last against Likar Ramos in a junior-welterweight bout and next fights Manny Pacquiao in a welterweight fight (at a catchweight). Assuming he will return to lightweight (which is not a safe assumption), I'm keeping Marquez as the No. 1 fighter there.
That's not the only movement from 135 to 140. Humberto Soto and Michael Katsidis are leaving the division, Robert Guerrero's cancelled fight against Marcos Maidana was at 140 and Brandon Rios has stated his intentions to move up. Because Rios has nothing scheduled and his last fight was at 135, I am keeping him ranked at lightweight. The other three are now junior-welterweights, and if they warrant a ranking, it will be in that division. The same philosophy will apply in every other weight class.
One other note, I'm not doing a full ranking of all 17 of the divisions. Below bantamweight, I'm basically doing a pound-for-pound of the fighters from 115 down to the minimum. Some of the thinner divisions (122 and 130 come to mind) will only have five fighters ranked. I am not denoting between champions and contenders. The champion will of course occupy the No. 1 spot when that applies. When it doesn't, the best fighter will occupy the top spot. Here it goes.