The Battle Begins: Naruto vs. Sasuke

is episode 107 of the original Naruto anime.

Synopsis
Due to the injuries he received in the Land of Tea, Sasuke is stuck in the hospital recovering. Angry that Naruto has continued to get stronger while he is still not strong enough to defeat Itachi, he challenges Naruto to a fight when he and Sakura come to visit. Naruto accepts, and the two head to the roof. After exchanging attacks, Naruto creates a Rasengan and Sasuke prepares his Chidori. The two rush towards each other, with Sakura screaming for them to stop. But before their attacks connect, Kakashi appears and redirects them into two water tanks. When Sasuke sees the difference in the amount of water flowing out, he smirks. But when he jumps off the roof onto a wooden platform, he notices that there is a huge hole in the back of Naruto's water tank. He angrily reflects on how much Naruto has improved and vows to beat him.

Tsunade informs Shikamaru that he impressed the Fifth Hokage and the feudal lords during his battle with Temari in the Chūnin Exams, and that he is being promoted to Chūnin. He then celebrates with Team Asuma.