Most surprising KO/TKO artists?

[Britkid]

Sweet Pea Whittaker stopped a fair few fighters

He had 1 first round ko in a world title fight.

Agreed but I would say in Lyle's defence, Whitaker did score some important and impressive stoppages. Lomeli looked a good win at the time; as you mentioned Nazario, who was coming off beating Rosario; and then you had the super fight saving (Vs De La Hoya) stoppage against Hurtado.

[El Kabong]

Sweet Pea Whittaker stopped a fair few fighters

He had 1 first round ko in a world title fight.

Agreed but I would say in Lyle's defence, Whitaker did score some important and impressive stoppages. Lomeli looked a good win at the time; as you mentioned Nazario, who was coming off beating Rosario; and then you had the super fight saving (Vs De La Hoya) stoppage against Hurtado.

Pernell is not known as a power puncher he's known as a very slick defensive fighter YET he could and DID have some very impressive KO's.

[mikeeod]

Julio Ceasar Chavez Jr. started out as a skinny volume puncher that could barely crack an egg. Despite hitting the dank instead of training, he had lineal champ Martinez on the verge of being stopped after landing some good shots. He definitely has become a ko/tko threat after a less than stellar start. The juice/PEDs have helped!

Another guy, to a degree, was Arturo Gatti. I remember watching him as a featherweight, and he was a very slick boxer who could punch, but was more boxer than puncher (watch his fight vs Patterson). He fell in love with the crowds admiration/support as well as the thrill of the knockout and turned into a hell of a knockout threat.

[Dark Lord Al]

Sven Ottke v Mundine was a very pleasing KO.

[greynotsoold]

Jeff Mayweather. He had real bad hand problems- his right hand looked mangled- and he won a lot but always by decision. Then he got his hand fixed and won four out of five by KO.

[jon09]

Bernard Hopkins over Oscar.

[Spicoli]

As far as least expected and devastating I put Groves ko over Fenech up there. Even after being belted by Nelson in rematch, I never thought a slick 'light hitter' like Grove to ice an always tough Fenech like this. Forgot what a rowdy wild scrap this was before it suddenly came to a close.

[Master]

Grove said that Fenech was bone dry coming into the ring and the trainer told him to start fast but even he was surprised by the clean KO.