At the Olympic stadium in Nouakchott, Zambia picked up a vital away victory, beating the hosts 2-1.
The Chipolopolo got into the lead in the 10th minute when Enoch Mwepu found the back of the net with a neat right footed finish. The visitors held on to this lead till the halftime break.
In the second half, Zambia doubled their tally when Prince Mumba finished off a move that was initiated by Patson Daka.
Going 2-0 down, the Mauritanians were not about to go down without a fight and they halved the deficit in the 69th minute when Amadou Niass found the back of the net with an effort from inside the box.
Despite late pressure to try and scrape off a point, Mauritania was not clinical enough with the Zambians holding off for the win.