The only ones who can deal with Naruto's speed is Minato. Now, there are other ways to deal with speed, such as intelligence. Itachi is someone with more cards up his sleeve than Gambit. If I were to give the medal to a ninja who can defeat Naruto without having space/time jutsu that would be Itachi. However, neither Itachi nor Minato are in the same block as Naruto. So the final will be either Naruto vs. Minato or Naruto vs. Itachi, though I predict it will most likely be the former.