Most skilled swarmer/pressure fighter

[sonnyboyx2]

Jack Dempsey
Roberto Duran
Mike Tyson

[joeandthebums]

Whichever category he falls into, Henry Armstrong.

[{Pito}]

Chavez Sr without a doubt. He's held great fighters at their lowest connect percentage in fights against him. He barely ever was hit clean. Even Duran was knocked out

[Mikhnienko]

Vicente Salvidar one of the best stalkers ever and perhaps thee best Southpaw one.

[Panamaniac]

1. Durán
2. Tyson
3. Pryor
4. Frazier
5. Dempsey
6. Chavez

[jiopsi]

Tyson, and it's not close.

[f15bone]

Never really thought of Tyson as an inside fighter per se...but when he was at his best he certainly got the job done...

Chavez Sr. was a beast inside...His hook to the body was nasty...

Lightweight Duran

Hagler

[Ray Corso]

As for pressuring an opponent and swarming into him with both hands LaMotta
was one of the best! Although Jake wasn't a power puncher he could wear anyone down with his pressure and determination. A true two handed attack and threw all the punches.
The Bull could Rage!

Ray.

[Sugar Adam Ali]

Hasn't been mentioned yet, and may not be a true "inside" fighter but a guy that put incredible amounts of pressure was tito Trinidad..

Every tito fight was the same

Rd 1 he would jab and feel you out, moving laterally, maybe unload if the moment presented itself (vargas)

2 he would jab and open up alittle more and instead of moving laterally he starts coming forward more

Rd 3 he is still jabbing but coming forward nonstop and throwing a lot of bombs..

And if at anytime tito ladded a big bomb early in the first 3 rds he would immediately turn into terminator mode and hunt you down throwing bombs for the rest of the fight..

From rounds 4 on, tito would abandon the jab for the most part, come straight forward and unload nothing but power shots, and would pick his tempo up in the late rounds...

Tito truly made a lot of world class guys buckle under the constant pressure.. Even hopkins who was dissecting tito was still being walked down until the stoppage

[phallus]

henry Armstrong, the only 3 div world champion in different weights at the same time, and he should have won the middleweight championship. greatest swarmer of all time