The Pyramids FC winger spotted goalkeeper Mamadou Diop off his line and unleashed a 55-yard shot that sailed over Diop and into the net in the 85th minute.
The result secures the Pharaohs' record-extending 27th AFCON appearance, as they sit comfortably atop Group C with 12 points, ahead of Botswana (6 points), Cape Verde, and Mauritania (3 points each).
Coach Hossam Hassan reshuffled his squad, opting for a 3-4-3 formation and making four changes to his starting lineup due to the absence of several key players.
Egypt adopted a cautious approach, relying heavily on counter-attacks. They created few chances, with Mohamed Hamdy and Osama Faisal unable to seriously test the Mauritanian keeper.
Mauritania’s best opportunity came in the 60th minute when Aboubakary Koita fired a shot from inside the box, but Egyptian goalkeeper Mohamed El Shennawy produced a brilliant save to maintain his clean sheet.
Adel, introduced in the 83rd minute to replace Faisal, made an instant impact, scoring the winner with his first touch of the game to give Egypt their fourth consecutive victory in the qualifiers.
The seven-time African champions will conclude their AFCON qualifying campaign in November with matches against Cape Verde in Praia and Botswana in Cairo on the 11th and 19th, respectively.
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