Venus and Putz beat the all-German pair of Daniel Altmaier and Jan-Lennard Struff in the quarter-final by a score of 6-3, 6-3 on Thursday.
Last year in Berlin, Liudmila Samsonova stunned the field by defeating Madison Keys, Victoria Azarenka, and Belinda Bencic in the final to claim her maiden career title.
Lakshya Sen, who had claimed his maiden Super 500 title at India Open in January, lost 18-21, 15-21 in 57 minutes.