Returning to the finals for the 1st time in two years and playing in front of the home crowd, the three-time Grand Slam champion snapped Siniakova's serve six times en route to the 13th WTA singles title of her career.
"This is a really special chance to win here, another title," said the German, who also upset first-seeded Petra Kvitova in the semifinals. "It's a great feeling, and thanks to everyone."
Kerber adds the Bad Homburg title to her other two home wins in Stuttgart in 2015 and 2016. Kerber is seeded 25th at Wimbledon and will face Serbian Nina Stojanovic in the first round next week.
The former No. 1 doubles player, Siniakova, drops to a career record of 2-4 in the singles final.
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