Sri Lanka on Monday defeated hosts Bangladesh by seven wickets in the first match of the tri-nation ODI series in Mirpur. Chasing 261 to win, the Lankans cruised to victory with 5.1 overs to spare. For Sri Lanka, Tillakaratne Dilshan scored 104. Brief score: Bangladesh: 260 for 7 in 50 overs; Sri Lanka: 261 for 3 in 44.5 overs