First one-day international, Colombo: Sri Lanka 234-6 (50 overs) bt Bangladesh 164 (40.3 overs) by 70 runs
Dilhara Fernando put in a superb spell of bowling as Sri Lanka beat Bangladesh by 70 runs in the first one-dayer.
Fernando wreaked havoc to leave Bangladesh reeling on 56-5
The hosts were struggling in Colombo on 67-3 but managed 234-6 thanks to Upul Tharanga (57) and Chamara Silva (65).
Then Fernando (4-24) ripped through the Tigers' top order after Shahriar Nafees (33) had got them off to a solid start.
Mushfiqur Rahim, Farhad Reza and Abdur Razzak all made 28 but Bangladesh were bowled out for 164 in the 41st over to go 1-0 down in the three-match series.
They next meet in the second one-day international in Colombo on Monday.
Sir Lanka won comfortably enough, but it was a far from straightforward start as Sanath Jayasuriya (21, Kumar Sangakkara (16) and Mahela Jayawardene (2) all fell cheaply.
But solid strokes from Silva and Tharanga, claiming their seventh and ninth ODI half-centuries respectively, led Sri Lanka to respectability.
Mashrafe Mortaza and Syed Rasel enjoyed the best of the Bangladesh bowling, but their two wickets apiece could not be matched by their costly team-mates.
Chasing 235 runs to win, Bangladesh got off to a promising start with openers Tamim Iqbal and Nafees striking up a strong partnership.
However, that all fell apart within the space of four overs as they went from 45-0 to 56-5.
Fernando took four of the wickets as Iqbal (11), Nafees (33), Tushar Imran (0), Shakib Al Hasan (0) and Mohammad Ashraful (4) all fell within quick succession before Sri Lanka wrapped up the win.