Dhaka: Nasir Hossain held his nerve, despite wickets falling around him and helped his side chase down 218 and clinch the series in the fifth and deciding day-night international in Dhaka on Saturday.
This is Bangladesh's third bilateral ODI series win against an established nation. This does not include their bilateral ODI wins against Zimbabwe. They whitewashed a weak West Indies team 3-0 in 2009, whitewashed New Zealand 4-0 in 2010 and now they have won this closely fought series 3-2.
The Bangladesh batting collapsed again as Roach ripped through the top order. However, a fantastic 81 run stand between vice captain Mahmudullah and captain Mushfiqur Rahim put Bangladesh back on track. However, they lost quick wickets again and it took a 53 run stand between Nasir Hossain and Mominul Haque to get Bangladesh closer to victory.
Mahmudullah is the Man of the match for his 48 and for picking up 2/38.
Earlier, Kieron Pollard and Darren Bravo hit contrasting half-centuries as the West Indies were bowled out for 217 in 48 overs
Pollard hit a return to form a robust 74-ball 85 and Bravo notched a sedate 108-ball 51 during their 132-run fourth wicket stand to lift the tourists from a struggling 17-3 after they were put into bat.
Bangladesh started on a positive note when they removed Kieran Powell (11), Marlon Samuels (1) and Chris Gayle (3) by the eighth over.
Paceman Shafiul Islam, who replaced injured Mashrafe Mortaza in the squad, dismissed Gayle for a fifth failure in as many matches to finish with 3-31 in his nine overs.
Pollard, who like Gayle was a big flop in the last four matches, hit a six for his first scoring shot as he batted with aggression. He hit five boundaries and eight towering sixes to take the attack to the Bangladeshi bowlers. He was finally dismissed in the 32nd over, bowled by spinner Mominul Haque.
The Pollard-Bravo stand for the fourth wicket is a new record in all West Indies-Bangladesh one-dayers, beating the 92-run stand between Jimmy Adams and Shivnarine Chanderpaul in Dhaka in 1999.
Bravo hit three boundaries and a six before he was caught off Mohammad Mahmudullah who finished with 2-38.
Devon Thomas chipped in with a useful 25 to take the West Indies past the 200-run mark.
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West Indies 217 (Pollard 85, Bravo 51, Shafiul Islam 3-31)
Bangladesh 221 for 8 (Mahmudullah 48, Roach 5-56, Narine 3-38)
Result Bangladesh won by 2 wickets
MOM Mahmudullah (Bangladesh)
Player of the series Mushfiqur Rahim (Bangladesh)