The triumph adds to the successful tour of the Caribbean for the Tigers who have also enjoyed their first Test series win overseas. Travis Dowlin struck his maiden international century as the weakened West Indies side racked up an impressive 274 for six in their 50 overs.
Bangladesh had never chased down such a total in any of their previous 199 ODI games but once again skipper Shakib Al Hasan produced a match-winning performance.
Shakib (65) and Mohammad Ashraful (64) put on 74 for the fourth wicket in just 10.3 overs — a partnership that turned the match in Bangladesh's direction. Shakib was fortunate to survive though when he brought up his 50 with a skied shot which was dropped by Darren Sammy as he collided with team-mate Dave Bernard in the deep.
The pair were both injured in the incident and more trouble was to come for West Indies when their main strike bowler, Kemar Roach, bowled a second 'beamer' and was barred from bowling by the umpire.
With no obvious sixth bowler in the team, wicket-keeper Devon Thomas took off his pads and bowled the final ball of Roach's over.
Score Board
WEST INDIES
Richards (run out) 20
Fletcher c Islam b Shakib 22
Smith (run out) 44
Dowlin (not out) 100
Reifer c Shakib b Islam 7
Bernard st Mushfiqur b Razzak 22
Lewis b Rasel 22
Sammy (not out) 24
Extras (LB-3, W-10) 13
Total (for 6 wkts, 50 overs) 274
Fall of wickets: 1-33, 2-52, 3-118, 4-134, 5-181, 6-245.
Bowling: Rasel 8-0-61-1, R Hossain 5-0-38-0, Shakib 10-2-42-1, Razzak 10-0-58-1, Islam 8-0-26-1, Mahmudullah 9-1-46-0.
Bangladesh
Iqbal c Bernard b Roach 29
Siddique c Roach b Bernard 23
Ashraful c Richards b Lewis 64
Hasan c Reifer b Bernard 20
Shakib c Richards b Sammy 65
Rahim c Sammy b Thomas 31
Mahmudullah c sub b Thomas 3
Islam (not out) 3
Razzak (not out) 11
Extras (B-5, LB-5, W-15, NB-2) 27
Total (for 7 wkts, 49 overs) 276
Fall of wickets: 1-46, 2-64, 3-116, 4-190, 5-238, 6-251, 7-261.
Bowling: Roach 7.5-0-55-1, Tonge 10-0-49-0, Sammy 10-0-39-1, Bernard 10-0-59-2, Lewis 10-0-53-1, Thomas 1.1-0-11-2.
Deccan Herald is on WhatsApp Channels| Join now for Breaking News & Editor's Picks