Zimbabwe swept aside Swaziland 4-0 in their 2017 Africa Cup of Nations Group L qualifier on Monday.
The hosts, who earned a 1-1 draw in Swaziland on Friday, dominated the return match in Harare to move three points clear at the top of the table.
Knowledge Musona opened the scoring on 53 minutes from the penalty spot and Costa Nhamoinesu made it 2-0 six minutes later.
Evans Rusike extended the advantage and Khama Billiat sealed the win late on.
Swaziland remain on five points, three points above Malawi and Guinea who play each other on Tuesday.
