In a straight up fair one. No flashy armors, no black fire, no Chidori. Just a classic man to man gladiator type fight.
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Sasuke was doing good at the start but Kinshiki outskilled him and was about to deal the killing blow until..... Sasuke escaped with Ameno. The only way I understand him losing with Ridoku chakra boosting all his stats is that he got rusty along with Naruto in peaceful times.
Should Sasuke do some sparring and practice with a real gladiator like Rock Lee so he won't lose again?