Cameroon were made to work hard to open the defence of their AFCON title with a win, as Ghana became the latest team to be upstaged by an underdog.
Ivory Coast began their campaign in the African Cup of Nations' toughest group with a 1-0 win over South Africa on Monday.
Manchester City winger Riyad Mahrez was on target as Algeria overcame Kenya 2-0, while Senegal began their AFCON campaign by beating Tanzania by the same score.
Trezeguet scored the only goal as hosts Egypt opened their Africa Cup of Nations campaign with a 1-0 victory over Zimbabwe in Cairo.
Uganda won at the Africa Cup of Nations finals for the first time in more than 40 years as they upset the Democratic Republic of Congo 2-0.
Zimbabwe players are threatening to boycott the opening game of the Africa Cup of Nations against hosts Egypt.
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