Congo went top in Group One of qualifying for the 2006 World Cup with a surprise 1-0 win over Mali.
Mali are stuck at the bottom of Group One
Oscar Mamouna got the only goal, picking up a long ball from his own goalkeeper and firing home at the other end.
It was one of the few bright spots in a generally poor encounter.
The result left Mali - semi-finalists at the African Nations Cup earlier this year - rock bottom of the group.
In Monrovia, Liberia drew a very poor match against Togo.
The game was most notable for the display of Liberia's striker James Dibbah - who refused to come off the pitch when the coach ordered him to be substituted.
Senegal, meanwhile, moved up to second - behind Congo on goal difference - with a 1-0 win over Zambia.
But coach Guy Stephan is coming under fierce pressure after the unconvincing win in Dakar.
The hosts won the match when striker Babacar Gueye tucked home the ball at the second attempt following a penalty box scramble.
The 2002 World Cup quarter-finalists also missed a penalty in the second half with Pape Bouba Diop blasting his spot kick against the bar after Ibrahima Faye was brought down in the box.
The Lions were booed from the field by a large percentage of the 50,000 spectators in the Leopold Sedar Senghor stadium in Dakar.
Stephan then received an equally frosty reception from the Senegalese journalists in the after-match press conference.
Senegal's French coach tried hard to sound pleased with his side's performance.
"I'm very happy with the result," he said.
"It was our 7th match in Dakar and our 7th victory, which is extremely positive.
"What is also positive is that we beat a team that was on top of the table, ahead of us."