Yes there is some Ninjas that can beat Naruto.. In the Narutoverse there isnt a A>B>C where naruto is A and therfore he can beat everybody.. remember power =/= strength. there are other ninjas that might beat him beacouse Naruto is still a little naiv and he tend to rush in.. im not saying Naruto is weak he is extremly powerful by now but just dont think he is untoucheble, he isnt..
Remember that even hashirama was even killed (its in the first databook) by someone in the many wars in the early stages of the founding of countrys.. and he was the Strongest, most powerful, hyped etc. ninja too date (except SO6P)
so in conclusion yes there is bound too be someone who can beat Naruto but in the same time could lose oo Sakura or moegi everybody can be defeated :D