This is one hell of a step up. You can pretty much call Yonnhy Perez a 122 LBS Paul Williams. This dude has a granite chin and an incredible workrate. He fights all 12 rounds with the same intensity as the second round. He has a solid repertoire of punches: left hook, upper cut, straight rights. He has a sick left upper cut, left hook combo. His jab is not too bad either.
I don't think Mares should try to out**** him straight out the box. I feel the first 4 rounds should be about measuring, testing power, and positioning. If Mares feels strong enough to take the fight straight to Perez after, go for it. But I'm very interested to see the improvements in defense the Mare camp has been working on. We're supposed to be seeing a more aggressive Mares, but with more headmovement and defensive counters.
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