The German, a semi-nalist last year who is gunning for a maiden Grand Slam title, turned in an accomplished performance en route to a routine 6-3, 6-3, 6-1 win in just 1hr 43mins.
Zverev is looking to become the youngest Grand Slam singles champion since Novak Djokovic won the title at Melbourne Park in 2011. He will next meet either Serbian 23rd seed Dusan Lajovic or Spain’s Pedro Martinez.