Alick Athanaze set the West Indies on the road to victory with 65 runs on his debut as they beat United Arab Emirates in Sharjah.
The win, by four wickets, on Friday gave the Windies a 3-0 clean sweep in the one-day series.
The UAE chose to bat first and was bowled for 184 in 37 overs in the third match, their lowest total in the series.
West Indies offspinner Kevin Sinclair, in his first appearance in the series, took 4-24 from 7.1 overs. Legspinner Yannic Cariah claimed two of the tail.
The West Indies eased to the target in 35.1 overs and won by four wickets, finishing on 6-185.
Both teams have used the series to prepare for the Cricket World Cup qualifiers in Zimbabwe starting this weekend.
Athanaze, a batting all-rounder from the Windward Islands, opened with a 45-ball 65, including nine fours and three sixes, to give West Indies a great start. He was second man out, leg before.
Shamarh Brooks added a patient 39, and captain Roston Chase completed the job with an unbeaten 27 from 32 balls.
Vriitya Aravind had top-scored for the UAE with 70.
The UAE made it to 3-150 in the 23rd over but collapsed after consecutive run outs of debutant Ethan D'Souza and Rohan Mustafa.
Aravind was lbw to Sinclair, hit front pad in line with middle stump, at 6-166 and the UAE lasted six more overs.
Opener and captain Muhammad Waseem supported Aravind with 40 in their partnership of 69.
Australian Associated Press