Namibia reached the Twenty20 World Cup second round for the first time on Friday when they defeated Ireland by eight wickets.
World number 19 Namibia, the lowest-ranked team in the tournament, chased down their modest target of 126 with skipper Gerhard Erasmus making an unbeaten 53.
Namibia will finish behind Sri Lanka in Group A barring a heavy defeat for the 2014 champions in their final qualifier against Netherlands later Friday.
That would put Namibia in the same Super 12 section as India, Pakistan, New Zealand, Afghanistan and Scotland.
Erasmus hit three boundaries and a six in his 49-ball innings while David Wiese, who played for South Africa at the 2016 World Cup, was undefeated on 28.
"I count on my senior men to stand up when the pressure is on. And two of us did it tonight. Hopefully we can do it through the tournament," added Erasmus who put on 53 for the third wicket with Wiese.
Wiese smashed two sixes and a boundary in a 14-ball innings which was positively whirlwind in comparison to Namibia's sedate early progress.
"It's completely overwhelming. I don't think I deserve to be sitting here. I think the captain Gerhard Erasmus deserves to be man of the match," said Wiese who had also taken 2-22 in the Ireland innings.
Ireland skipper Andy Balbirnie was distraught by the loss.
"It hurts a lot. We really wanted to win but we just didn't get enough runs," he said.
"I think Wiese played a brilliant knock when the run-rate was at around eight an over, and their skipper saw them home."
Earlier, Ireland had appeared well set at 71-2 at the midway point of their innings but the runs dried up as Namibia's bowlers turned the screws, restricting their opponents to 125-8.
Openers Paul Stirling and Kevin O'Brien gave Ireland, who won the toss and chose to bat, a flying start.
They put on 67 for the first wicket before Stirling fell to left-arm finger spinner Bernard Scholtz in the eighth over.
Stirling made 38 with five fours and his team's only six while O'Brien hit 25.
Balbirnie contributed 21 before he fell to seamer Jan Frylinck attempting to force the pace. Only 54 runs came off the last 10 overs with Ireland's next seven batsmen all failing to reach double figures.
Frylinck finished with 3-21.
As well as securing the last place in the Super 12 stage, Namibia are also guaranteed a spot in the 2022 tournament in Australia.
Earlier on Thursday, Scotland reached the T20 World Cup second round for the first time with a thumping eight-wicket win over Oman.
The Scots comfortably chased down their target of 123 with 18 balls to spare to register their third win out of three in qualifying.