Afghanistan captain Rahmat Shah scored a superb unbeaten century and shared a record third-wicket partnership with Sediqullah Atal as the tourists beat Ireland by six wickets in the fifth and final one-day international.
Saturday's victory in Belfast saw Afghanistan complete a dominant 4-0 series win after the opening match was washed out.
Shah, who finished on 143 not out, added 201 runs with Atal after Afghanistan slumped to 22-2 inside six overs, with Liam McCarthy removing both openers.
Their partnership was a new third-wicket record for Afghanistan in all ODI cricket, surpassing the 184-run stand between Shah and Hashmatullah Shahidi against Ireland in Abu Dhabi in 2021.
It seemed Ireland would at least enjoy a consolation win on Saturday after all-rounder Curtis Campher's quickfire 96 took them to a total of 298-7 in their full 50 overs.
And they were even better-placed when McCarthy (3-47) dismissed Ibrahim Zadran and Rahmanullah Gurbaz early in Afghanistan's pursuit of a target of 299.
But Shah and Atal rebuilt steadily before unleashing against Ireland leg-spinner Gavin Hoey, whose 10 wicketless overs cost 73 runs.
Shah's 109-ball century included nine fours and a six, with Atal narrowly failing to record hundreds in consecutive games after being brilliantly caught by Cade Carmichael looking to pull McCarthy out of the ground.
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Afghanistan still needed 76 runs in almost nine overs at that stage but, with Azmatullah Omarzai adding a rapid 24, they won with seven balls to spare.