Cameroon had to work hard to open its title defence with a win at the African Cup of Nations, and Ghana was the latest team to be upstaged by an underdog.
Cameroon found it difficult to break down Guinea-Bissau until defender Yaya Banana was left unmarked from a corner to head in the opening goal in the 66th minute.
Cameroon’s second goal came straight after when substitute striker Stephane Bahoken got a lucky break to score with his first touch.
The win put Cameroon top of Group F.
Ghana fought back from 1-0 down to lead 2-1 against Benin in the group’s second game in Ismailia, Egypt, on Tuesday.
Ghana’s goals came through the Ayew brothers, Andre and Jordan.
But defender John Boye was given a second yellow card for time wasting and sent off and Benin equalised for a 2-2 draw.
Nigeria who won their opening game by a lone goal will face fellow West African brothers Guinea in first game of the day. Nigeria needs a win to be the first team to book a place in the next round. Guinea on the other hand need to win to brighten their chances.
Host nation, Egypt will play Uganda, while Zimbabwe will lock horns with Congo DR, a win for either Egypt or Uganda will guarantee either team a place in the next round.