Mannarino, also runner-up in Antalya last year, fought back in the second set and was helped by Dzumhur's slew of errors as he broke the Bosnian's serve twice en route to forcing a decider.
"It feels great," the 26-year-old Dzumhur said. "(This is my) third title, the first this year and my first ever on grass."
Dzumhur opens his Wimbledon campaign against German Maximilian Marterer on Monday, while 22nd-seed Mannarino, who reached the fourth round at the All England club last year, takes on Christian Garin in his opening match.
(Reporting by Aditi Prakash in Bengaluru, editing by Ed Osmond)
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