I don’t know, something tells me Dubois will jump on Usyk from the opening bell and try to turn it into a slugfest, which Usyk will likely try to avoid.
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I agree Dubois might try to test Usyk early, before he finds his rhythm, but I don't think he'll go all out in the first round. That would be too risky. Dubois is younger, but much more muscular, and keeping that muscle mass oxygenated takes a toll on the cardio. Going too hard too soon and failing to get the KO could cause Dubois to gass out early, which would be a real gift to Usyk.
I rather expect Dubois to keep exploding in short bursts, while preserving his energy in between.