In the second game, Morocco thrashed Kenya 4-0.
A blunder by Senegal goalkeeper Khady Faye gifted Melissa Bethi a goal which clinched a 2-0 victory for Algeria on Sunday in the 2026 Women's Africa Cup of Nations (WAFCON) opener.
Bethi struck on 88 minutes and Algeria also scored late in the opening half in Rabat with captain Marine Dafeur converting a 42nd-minute penalty.
Senegal created early pressure without seriously threatening to score and Algeria gradually took control with some neat passing to achieve a deserved victory.
Algeria began the match as slight favourites as they are ranked one place above Senegal in Africa and five places higher in the world.
Controversial penalty
The penalty awarded to Algeria late in the opening half by the South African referee was debatable as there was minimal contact between Senegal captain Korka Fall and Amira Braham.
After a VAR review backed the match official, Bristol City midfielder Dafeur struck a left-foot shot into the right corner of the net.
Algerian Lana Smits seemed to commit a similar penalty-area foul on Tall Pene just before the hour mark but play continued.
Morocco thrash Kenya
Any hopes Senegal had of snatching a draw disappeared when a weak clearance by Faye was intercepted and a quick pass set up Bethi to score with a low shot.
Hosts Morocco made an immediate statement as they swept aside Kenya 4-0 in their opening Group A match at the Moulay El Hassan Stadium in Rabat on Sunday.
Ibtissam Jraidi scored twice, while Sakina Ouzraoui and Meriem Atiq were also on target as the Atlas Lionesses produced a dominant performance in front of home supporters.
The result sent Jorge Vilda’s side to the top of Group A on goal difference ahead of Algeria.
Record 10-time champions Nigeria debut on Tuesday in Group C against Malawi, who boast star forwards in the Chawinga sisters. Tabitha plays for Lyon and Temwa for Kansas City Connect.
The tournament is due to run from 26 July to 16 August.
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