Ismael Diakite netted very late to seal Mauritania's 4-0 victory over a hapless South Sudan side, and the Les Mourabitones won 5-1 on aggregate over the Tigers on Tuesday night.
The 2018 FIFA World Cup qualification (CAF) first round second-leg encounter was played at the Stade Olympique, in Nouakchott.
The Les Mourabitones, and Tigers had played to a 1-1 draw in the first-leg encounter at the Juba National Stadium, Juba in South Sudan on Thursday.
It took only four minutes for Mauritania to break the deadlock through Ahmed Khalil much to the delight of the home crowd.
Les Mourabitones were unable to score another again in the first-half as the Tigers managed to contain them until the referee blew the whistle for half-tim.
Nevertheless, the home side did double their lead in the 62nd minute through their 20-year-old striker Boubacar Bagili.
Les Mourabitones continued to press the South Sudan defence for more goals, and Moussa Samba made it 3-0 with five minutes left on the clock.
Saudi Arabia-based striker Ismael Diakite sealed Mauritania's 4-0 victory on the night in stoppage time with a decent finish.
African football giants Tunisia will be Mauritania's next opponents in the World Cup qualification second-round in November, 2015.