Bangladesh's highest Twenty20 total didn't matter as Sri Lanka chased it down with 20 balls to spare to win the opener of the two-match series on Thursday. After Bangladesh made 193/5, Sri Lanka raced to the win with 194/4, spearheaded by opener Kusal Mendis' maiden half-century, a 27-ball 53.
Sri Lanka has taken the one-day international and test series, and needs one more win in its last tour match on Sunday to sweep up all three formats.
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Mendis and Danushka Gunathilaka shared a 53-run opening stand. After Mendis fell at 90/2, Dasun Shanaka and Thisara Perera combined for 65 off 30 balls in an undefeated fifth-wicket stand.
Shanaka was unbeaten on 42 off 24, and Perera was on 39 off 18.
Left-arm spinner Nazmul Islam took 22/5 on his T20 debut for Bangladesh.
Earlier, Mushfiqur Rahim hit a career-best 66 not out in T20s to help Bangladesh post a respectable total. Also, opener Soumya Sarkar scored 51, his maiden half-century.
Sarkar's attacking approach kept the scoreboard soaring, with Bangladesh bringing up its 100 in 10 overs.
Legspinner Jeevan Mendis, with 2/21, stalled Bangladesh's progress but Mushfiqur and captain Mahmudullah shared 73 runs for the fourth wicket to keep the side on track.