Tyson had a great jab considering his short reach. Duran and Chavez both had excellent jabs. Bob Foster as well. Liston's was not great in a technical sense, but more than often it served him well. Old Foreman's jab was immense. Bowe had something similar going on. Those are the ones that pop up directly. Also agree with Hearns.
Many of the names mentioned aren't pressure fighters at all. Hearns & Holmes in particular. I was also impressed by Tyson's jab.
Joe Louis has to be on the list. Had a jab like a bludgeon, which he followed with his masterful combinations.
Hagler had a great jab very accurate.azumah nelson also had a hard hurtful jab.dont know if they are pressure fighters but they were aggressive guys who hunted fighters down.