Tamim Iqbal scored his ninth ODI century while Sabbir Rahman hit a fifty as Bangladesh run comfortable in their first ODI against Sri Lanka on Saturday.
After the fall of opener Soumya Sarkar (10) on 29, Tamim and Sabbir made 90 in the second wicket.
Sabbir departed after making 54 in 56 balls, but Tamim did get another century.
The visitors are now on 243 for 3, with Tamim not out on 101 and Shakib Al Hasan unbeaten on 49.