كتب : Amro Hassan
The former Ismaili man scored his team's consolation from a free kick outside the Nassr box.
The strike takes Abd-Rabou's tally to eight goals for Ahli since joining the club on loan from the Dervishes in the summer.
Following the defeat, Ahli now have slim chances of reaching the cup semi final as they lie third in their goop with seven points.
The Emirate cup games are played through three groups, where the winners qualify for the semis alongside the best second-placed team.