The world number 20, who ousted second seed clay court specialist Roberto Bautista-Agut in the last four, needed just over an hour to capture his third tour title.
The start of the final on a soggy day in Munich had to be delayed half a dozen times and Zverev had an equally slow start, falling 4-2 behind against the 158th-ranked Argentine, who was contesting his first ever tour final.
The German, though, battled back, winning 10 points in a row and then clinched the first set without losing another game.
An early break in the second was all it took for the talented Zverev -- seen as a likely future grand slam winner -- to secure the title on his first match point and set a marker ahead of the French Open starting on May 22.
(Reporting by Karolos Grohmann, editing by Pritha Sarkar)
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