Zverev: "I can do a lot of damage when I play like this".
Alexander Zverev has qualified for the quarter-finals of the Australian Open, following his four-set victory over Ugo Humbert.
He spoke about his chances in this tournament and how he feels about his current game.
He declares: "All players who reach this stage play very well. Anyone who reaches the quarter-finals or semi-finals deserves to do so.
There's no easy way to get there. Sometimes the draw is a little more open, and other times you beat players who feel uncomfortable against you.
To reach the quarter-finals, you have to play great tennis. In my head, I know I'm playing well. I can feel it on the court.
I feel I can do a lot of damage when I play like that, but my opponents feel the same.
From now on, it's only going to be tough battles."
He will face Tommy Paul in the quarter-finals in Melbourne.
Australian Open 
