Naruto wins this pretty handily, and would have won even if genjutsu was unrestricted. With full knowledge Naruto knows that Itachi cannot spam his Mangekyo Techniques without experiencing significant fatigue, and thus he can win this match quite ably via wearing him down. SM sensing allows him to anticipate the chakra build-up for Amaterasu before it is launched and pre-empt it either by summoning a clone in front of him or using
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.
Once Ma and Pa are summoned they too can block Itachi's sight with
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, and would also have sensing to anticipate Amaterasu. With Ma and Pa out Naruto also gains unlimited SM, which allows him to spam his clones now and bombard Itachi with large scale attacks like
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. And he also gets a chance to temporarily paralyse Itachi with
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, which could potentially cost him the match.
Itachi is also not going to be able to catch Naruto with Susano'o. Besides the fact that he has no reason to engage Susano'o in close combat, he can keep it at bay with Rasenshurikens, whilst his clones assault him from behind with
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. In the unlikely event that he is within striking distance of Susano'o, Naruto has enough reflexes to dodge Totsuka and Yasaka Magatama due to his performance against the Raikage,
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. Susano'o gets obliterated immediately once Naruto gets
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pulled off. Yata Mirror does not have the feats to tank an attack like that, and even if it did, the destructive range of that attack covers an area far wider than just in front of Itachi.
Regardless, Itachi can't keep Susano'o up forever, can't tag Naruto with it, and will only be wasting chakra keeping it up. Unfortunately he will need it just to defend himself from Naruto's large-scale attacks, which means he will be worn down eventually if said attacks don't kill him. Amaterasu will be sensed beforehand and can be countered consistently with clones or dust clouds. His other Katons are a non-factor as well due to SM durability and the fact that Rasenshuriken eclipses them all in power. Itachi would also be committing suicide if he engages a guy
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in taijutsu. Thus Naruto takes this handily.