FIghters who turned into a knockout artist later in their carreers

Amir Khan

 

in the amateurs?

 

Hits harder than Spence!

 

he always hit hard most of his wins are tko's

 

We were just talking about Freddie Steele in Classic.

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Sho Kimura and Shinsuke Yamanaka both deserve a mention

 

the weight gain can help you become a kockout artist, I expect.

 

I didn't think Chisora had the power to take out Takem like he did. Before I saw him as one of the weaker punchers in the HWD.

Tony Bellew seems to have grown into his power as he has gone up the weights, the power he has been showing at Cruiser and Heavy seems a world away from the guy who lost to LHW Nathan Cleverly.

Also to some extend Ricky Burns learned late in his career to sit on his punches better and showed knockout ability, earlier in his career he was winning fights on points alone. I am not sure these count as knockout artists but did show greater punching power later in their careers (if you also factor in stepping up in quality).

 

Dude there's a special hell for ppl. who misspell 長谷川 穂積, or as known in the West, Hasegawa Hozumi. But good shout.

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Froch didn't have that one punch KO power till later in his career when he knocked out George Groves in front of 80,000 people

 

Jermell Charlo looks to be turning out that way

 

Monte Barrett, he started off as a switch hitting
boxer with not very much power, later in his career he turned into a warrior
that pummeled guys

(notably dropping the vibranium chinned David Tua)

 

I think that has to do more with groves being a bit chinny

 

That is a good answer. Earlier Witter didnt go for the KO but he changed his style and started KOing his opponents