Cameroon defeated Gabon 2-1 in Yaounde and completed a climb from the bottom to the top of a World Cup qualifying group within five days.
Midfielder Jean Makoun and striker Samuel Etoâ€™o scored for the â€˜Indomitable Lionsâ€™ before striker Daniel Cousin set up a tense finish with a last-minute goal.
The five-time World Cup qualifiers won 2-0 in Libreville last Saturday and the double over their central African neighbours has turned French coach Paul le Guen into an instant national hero.
The former Lyon and Rangers coach took charge last month and guided Cameroon to a 2-0 friendly victory in Austria ahead of the World Cup fixtures against a Gabonese side seeking a first World Cup appearance.
But if the â€˜Lionsâ€™ conquer Togo at home on October 10 and Morocco away on November 14 they will stay on top and go to South Africa for the first World Cup staged on the continent.
Cameroon have seven points, Gabon six, Togo five and Morocco three in easily the most exciting of the five groups.