Nick Kyrgios has said that he is "feeling confident" after he battled past Ivo Karlovic in the Australian Open second round.

The Australian teenager eventually prevailed 7-6 6-4 5-7 6-4 in the match of the big servers, and he hopes that it can be the start of a strong run at his home Grand Slam.

He told reporters: "I'm feeling confident right now, especially after I played a good clay-courter in the first round. I thought he played really well. Obviously, physically backing up after five sets as well, I can take massive confidence out of that.

"I thought Ivo had the best year of his life last year. He got to top 20 at some stage. He's 35 now. He's playing some good tennis. With that serve, he can obviously beat a lot of players. He beat Djokovic a couple of weeks ago. I knew he was going to be tough. That gives me massive confidence."

Kyrgios will play Tunisian Malek Jaziri in the next round.