Well thats the whole point isn't it? Mayweather is one of the best fighters in the world 1-6....he is just as good in rounds 7-12. So it stands that he would be one of the best after the 6th round as well. If the question had been "What fighter turns up the heat the most after the 6th" I wouldn't include PBF. But one of PBF's strengths is the fact that he doesn't make mistakes the whole fight, picks you apart and beats you, for all 12 rounds.
povetkin is not proven yet. the first 5 rounds or so against byrd was fought at a canter , but he did step it up a gear late, albeit to me he does not have a 5th gear but chugs along in 2nd and 3rd.
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Has to be JC and Pac tied at first place. For a big guy, JC's workrate is very impressive. However his punches aren't powerpunches. Pac on the other hand throws mostly power punches.
Well 3 have, out of 31 so...... But he is known to get off a little slow sometimes (Zertuche) but by round 6 he's tearin into that ass and like you said by 9 it's 92% of the time already over.