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His second-half strike cancelled out Youssef Msakni’s penalty as the teams shared the points in the first match of the group – which also includes Mauritania and Mali.
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There were few chances created on either side and it seemed as though Msakni's strike - which came after Naim Sliti was brought down in the penalty box - would be enough to secure victory.
But when Tunisia's goalkeeper - Farouk Ben Mustapha - pushed a shot from Mateus into the path of Djalma, he made no mistake and earned a point for his side.
Tunisia play Mali in their next match on Friday (3:30pm kick-off), while Angola take on Mauritania on Saturday (3.30pm).
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