The Cairo giants top their Group with maximum four points after thrashing Saudi side Mudhar 36-30 in the Group opener on Tuesday.
The Red Devils produced a strong performance against the winner of the European league to claim a precious win in the last minute of the game.
In the semis, Ahly will face the winner of the game between defending champions SC Magdeburg of Germany and Saudi side Khaleej on Saturday.
European champions Barcelona and Vive Kielce will face off in the other semi-final also on Saturday.
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