Juventus have returned to the top flight after their series of poor results. Slowly, their position in the Serie A standings is getting better. The match against Napoli in January is very important for the Old Lady to win to close the gap with them. But to target the Scudetto seems to be very difficult to realize. Napoli have put in some amazing performances, but we don't know how they will fare after the World Cup.
Juventus have had some impressive victories over Inter and Lazio but that's no guarantee they can do the same with Napoli. Napoli will initially have the advantage in this game - they can afford to draw this game, so they will choose tactics as they wish, while Juventus must play to win (and a defeat will bury Juventus completely). I think that I will bet on the victory of Napoli in this game.