The sole goal of the contest arrived in the 11th minute when defender Ahmed Samy rose highest to head home, giving the Cairo side an early advantage at the New Suez Stadium.
Pyramids controlled large periods of the match and defended resolutely to protect their lead, extending their perfect record to three wins from three matches. The result lifts them clear at the top of the table with a maximum nine points and a goal difference of +6.
South African coach Rulani Mokwena has made an impressive start to life in charge of the club. Pyramids have scored six goals and conceded none so far this season, following earlier victories over Ghazl El Mahalla (3-0) and Abu Qir Semad (2-0).
Al Masry, who had also begun the campaign strongly with two wins, suffered their first defeat of the season and drop to fifth place with six points from three matches.
The victory strengthens Pyramids’ position as early pace-setters in the Egyptian top flight as they continue their bid for a first league title. Mokwena’s side will now turn their attention to the next round of fixtures while maintaining their unbeaten and clean-sheet record.