Defending champions Algeria have lost 1-0 to Equatorial Guinea in one of the biggest upsets in Africa Cup of Nations, to cap a day full of shock results.
In other action, Ivory Coast and Algeria were both held to unexpected draws while Tunisia were the sole favourites to win.
Equatorial Guinea defender Esteban Obiang arrived at the back post to connect with a corner in the 70th minute for the winner, ending a four-year unbeaten run for African champions Algeria and leaving their title defence in disarray.
Algeria launched attack after desperate attack in the last 10 minutes but Riyad Mahrez and his teammates couldn’t find a way past 20-year-old goalkeeper Jesus Owono.
Algeria, after being surprisingly held 0-0 by Sierra Leone in their first game, are bottom of Group E going into a final group game against two-time champions Ivory Coast.
Sierra Leone capitalised on a terrible goalkeeper error deep in stoppage time for a 2-2 draw against group leaders Ivory Coast.
Gambia converted a 90th-minute penalty for a 1-1 draw with Mali that left tournament debutants the top of Group F.
Gambia and Mali both scored penalties that were awarded after VAR checks.
Ibrahima Kone converted for Mali in the 79th minute before Gambia replied through Mussa Barrow in the last minute.
In the other game in that group, Tunisia recovered convincingly from their opening loss to Mali to beat Mauritania 4-0, and provide the only expected result of the day.
Previously best known for being the smallest country in mainland Africa, Gambia is unbeaten in its first two games at a major tournament, having defeated Mauritania to commence their campaign.
In a disastrous finish for Ivory Coast, goalkeeper Badra Ali Sangare landed awkwardly while trying to gather a header from one of his defenders that was going out for a corner, and the ball slipped out of his grasp, allowing Alhaji Kamara to score Sierra Leone’s equaliser.
Sierra Leone are making their first appearance at the finals in 26 years and have now taken a point against two heavyweights in Algeria and Ivory Coast.