Zverev, on Wednesday night, needed to mount a late comeback from 5-6 down in the first set, saving two set points as he took it to a tie-break, which he won after again saving another set point, reports Efe.
The World No.5 broke Gojowczyk's serve at 4-3 in the second set, which he finished off to win 6-3.
Zverev will now face Ryan Harrison of America, after he knocked out Argentine Diego Schwartzman 6-3, 5-7, 6-4.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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