Although not your typical pressure fighter, I think Jose Napoles deserves a mention here. At his best Napoles would apply subtle pressure by taking centre of the ring and countering punching whilst going forward, almost defending himself as he attacked. His jab was perfect for the role in which he employed himself. The jab would be popping out just to keep his opponent busy and allow Napoles a platform in which to start his attacks. But the way his jab kept his opponent busy but gave Napoles time to think/rest really did keep the pressure on his opponent effortlessly.