5. Kelly Pavlik
After losing to Joe Calzaghe, Hopkins moved down to a catch weight limit of 170 pounds to fight Middleweight kingpin, Kelly Pavlik.
Pavlik entered the fight with the mindset of knowing he destroyed Jermain Taylor twice. The same Taylor who beat Hopkins twice.
With that in mind, Pavlik and many of the media, thought the younger, stronger fighter would work the older Hopkins into retirement.
That was simply not the case as the 43-year-old Hopkins fought faster and smarter than his 26-year-old counterpart. Hopkins would go on to dominate the fight, proving to the world that the old man could still fight.