Zverev was playing indoors for the first time this year after a mixed record on indoor hard courts in 2019. He has been strong in those conditions in the past with three career indoor titles, including the 2018 ATP Finals.
He had seven aces and didn’t face a break point against Verdasco. He will play Lloyd Harris next in the quarterfinals.
Zverev is looking for his first title of the year and his third in his native Germany following victories at the clay-court Munich tournament in 2017 and 2018.