David Goffin helped Belgium get back into the contest with a clinical 6-3 6-3 win over world number four Zverev to leave the tie at 1-1. But Kerber and Zverev were too strong for their rivals in the deciding mixed doubles rubber, winning 4-2 4-3.
Kerber started her singles match slowly, conceded an early break but fought back to claim three games in a row. She saved a set point at 5-6 and then forced a tiebreak which she won with a crisp backhand winner.
The former world number one raced to a 3-1 lead in the second set as Mertens struggled to cut out the errors. Despite saving a match point, Mertens could not match her rival in the tiebreak as Kerber prevailed in two hours.
"It gives me a lot of confidence to start the year like this," said the world number 21. "I think I need a few more matches to really get into my rhythm. However, for a start it was a good job.
"My goal is to play the three matches, hopefully four, and to find a good transition from all the practice to the match court ahead of the first grand slam of the year."
(Reporting by Shrivathsa Sridhar in Bengaluru; Editing by Christian Radnedge)
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