Ricardo Lopez. It was almost automatic...if he managed to put an opponent in serious distress, then that opponent wasn't making it to the final bell. Witness his bouts with Nene Sanchez, or Vorapin, or Potelo, or Rocky Lim, or Ohashi for proof of this claim. If an opponent was stubborn, or granite jawed, then he'd be more patient, but, on the whole, he's one of the best finishers that ever existed.
I'd like to say Julian Jackson but he tended to put them away before the nerve cells let the brain know that they were hurt.:yep