Alcaraz has been quite forthright about his desire to break records. He recently admitted that the only records he's chasing after are those that Novak Djokovic has been setting recently, which tells you all you need to know.
He's not aiming to be second-best but rather the best of all time. While being confident is great, too much confidence can be a problem as well.
Right now, he's pretty confident, as he reached his first quarterfinal in Melbourne, and he's happy with his recent level and believes that he's improving with every match.
"It's great to find this level, to play this level in the matches. I'm feeling better and better every day. I'm feeling better and better every match that I'm playing. Coming into the quarterfinal with a lot of confidence."
He has steadily improved with every match but will be facing Alexander Zverev next. The German is a player who has given him some trouble in the past, beating him in their most recent match at the ATP Finals.
The conditions for their quarterfinal match will be totally different and more like what Alcaraz likes, so he'll have a decent chance. On top of that, the German spent far more time on the court, and that's something that the two-time Grand Slam champion wants to use to his advantage.
"I will try to take this as an advantage, the confidence that I have and the level that I'm playing. But hopefully in the quarterfinals against Sascha, will play a better match than today."
The winner of this match will take on the winner of the quarterfinal meeting between Daniil Medvedev and Hubert Hurkacz, meaning that neither will get another easy match.