Cameroon and Ghana, two of the most successful teams in Africa Cup of Nations history with nine titles between them, cancelled each other out in a forgettable 0-0 draw on a day of three stalemates.
Ghana nearly snatched the points in the 88th minute when Kwabena Owusu intercepted a dreadful Jean Armel Kana Biyik pass, charged forward and fired a ferocious shot against the bar.
Angola and Mauritania drew 0-0 in Group E, leaving both sides facing a battle to advance to the knockout stages. It was a second draw for Angola, while Mauritania, making their tournament debut, picked up their first point.
Benin and Guinea Bissau completed a hat-trick of goalless draws with a stalemate that left both teams waiting for their first-ever win at the competition. The teams rarely looked like breaking the sequence of blanks in a scrappy match short of clear chances.