Ireland beat Namibia by eight wickets in the second one-day match between the sides at Stormont on Tuesday.
The game was reduced to 38 overs per side after rain delayed the start until 1400 BST and Namibia batted first.
Namibia were 175 all out off 36 overs, Louis van der Westhuizen top scoring with 34 and John Mooney and Kevin O'Brien taking three wickets apiece.
Ireland replied with 176-2 off 30.2 overs, Alex Cusack ending 59 not out and William Porterfield scoring 45.
Namibia won the toss and opted to bat first.
Namibian wickets fell steadily, but Nicolaas Scholtz ended 31 not out.
Mooney ended with figures of 3-31, O'Brien 3-50, George Dockrell 2-26 and Boyd Rankin 1-9.
Paul Stirling scored 26 in Ireland's reply and Niall O'Brien was 38 not out.
Christi Viljoen and Louis Klazinga both took one Irish wicket.
Ireland won the first match on Monday by 26 runs with all-rounder John Mooney top scoring with 86.
After Tuesday's match Irish captain William Porterfield said his side's display had been "more professional and more thorough" in the second match of the series.
"We were more positive and the top four batsmen took responsibility as they should do."
Ireland play Sri Lanka and Scotland in a triangular series in Scotland next week.
"This was good match practice for next week and it was good to get some gametime together as a squad.
"Come Monday we should be where we want to be," he added.
The skipper revealed that Trent Johnston should be fit to face Sri Lanka after missing Tuesday's game because of a knee injury sustained in the pre-match warm-up.