Bangladesh spinners bagged all the wickets when West Indies tried to chase down the big target of 297 runs, and helped the Tigers win the match by 179 runs on Thursday evening in Dhaka.
With this win, Bangladesh sealed the series by 2-1.
Left-arm spinner Nasum Ahmed and Rishad Hossain bagged three wickets each. Mehidy Hasan Miraz and Tanvir Islam shared the other four wickets equally among them.
Akeal Hosein scored the highest of 27 for the West Indies, but that was not enough for them to chase this big total. Some of their other batters also got good starts, but failed to maintain.
West Indies were wrapped up in 117 runs in 30.1 overs.
Earlier, riding on a 176-run opening stand between Saif Hassan and Soumya Sarkar, Bangladesh amassed 296 for 8.
It was Bangladesh’s highest total in ODIs in Mirpur in seven years.
Before departing for 82 off 72 balls with six fours and six sixes, Saif shared a 176-run partnership with Soumya.
Soumya fell for 91, missing a century by just nine runs. He struck seven fours and four sixes.
Bangladesh set a new record for sixes in an ODI in Mirpur, clearing the rope 11 times. Their previous best at this venue was 10.
Despite a flying start from Saif and Soumya, Bangladesh couldn’t push past the 300 mark.
For West Indies, Akeal Hosein claimed four wickets while Alick Athanaze picked up two.