Best jab.

[Easy Work.]

That's not a jab but an illegal use of the stiff arm. A typical Wlad tactic.

not ilegal at all lol, thats jsut keeping youer opponent at a distance with your hand. Lennox lewis, ali, have both done this

[Boxfan83]

GGG, Cotto, & Peterson although Peterson didn't show it against Garcia...

[BodiesInFlight]

Any fighter who's jab could knock you down has the best jab in my opinion.
That goes to Wlad, and Cotto.

I guess Taishan should be mentioned in there too

[Tom Cruise]

How did we go four pages without mentioning Mayweather?

I went back to the OP to check if he hadnt specifically excluded him.

He has a ridiculously good jab, versatile too.

Definitely has to be up there.