This means Zverev is through to the quarterfinals of the year's last Grand Slam tennis tournament.
The quick victory in three straight sets was a welcome change for Alexander Zverev, whose first- and second-round matches were marathons and did not end until late at night.
"I don't know what to do now that it's not even midnight yet. Maybe I'll go to the training ground, or to a bar - that was a joke of course," he says.
Compared with the first matches, my level has improved.
In the quarterfinals, Dutch veteran Botic van de Zandschulp awaits.
