Openers Kusal Mendis and Danushka Gunathilaka (30) made 53 in the first five overs to set the ideal platform for the visitors, and although debutants Nazmul Islam and Afif Hossain struck three times in quick succession, two fiery innings from Dasun Shanaka and Thisara Perera did the job for Chandika Hathurusingha's team. Sri Lanka won the Test series 1-0 and will now be eyeing to emulate their performance in game's shortest format. Mendis smashed 53 off 27 balls while Dasun Shanaka hit an unbeaten 42 as the visitors eased past Bangladesh's record total of 193 for 5 with 20 balls to spare.
It was the 18-year-old Hossains first ever victim in worldwide cricket, and as one of four debutants in an experimental Bangladesh line-up, he was not alone in enduring a tough day with the ball.
Bangladesh will be without the services of regular captain Shakib-al-Hasan and thus Mahmudullah will lead the side.
Five Bangladesh bowlers conceded over 10 runs per over and only one of the four debutants, left-arm spinner Nazmul Islam, was impressive with figures of 2-25.
After Sri Lankas flying start, the business end of the innings was coolly negotiated by Shanaka (42*) and Perera (39*), whose unbroken 65-run stand was posted in just five overs as Bangladeshs resistance faded. Sri Lanka's previous-best T20 chase of 176 came against Australia.
The second match will be played in Sylhet on Sunday.