"The Battle Begins: Naruto vs. Sasuke" (オマエと戦いたい!ついに激突 サスケVSナルト, Omae to Tatakaitai! Tsui ni Gekitotsu Sasuke tai Naruto) is episode 107 of the original Naruto anime.
Due to the injuries he received from the Land of Tea, Sasuke is stuck in the hospital recovering. Meanwhile, Shikamaru gets promoted to chūnin by Tsunade. Later on, Tsunade starts the surgery on Rock Lee. Angry that Naruto has continued to get stronger while he is still not strong enough to defeat his brother Itachi, Sasuke challenges Naruto to a fight when he and Sakura come to visit him. Naruto accepts, and the two head to the roof. After exchanging a series of attacks, Naruto forms his Rasengan as Sasuke prepares his Chidori. The two then rush towards each other, with Sakura screaming for them to stop.