Sean Phillips' second century of the tournament helped Nigeria establish a strong position at the top of the table in the ICC Africa Division 2 event.
He smashed 105 off just 64 balls as Nigeria posted a massive 208-4 in 20 overs, with Ramit Gill also making 59 off 27 balls, before bowling Swaziland out for just 46, with Akolade and Awolowo both taking three wickets.
Botswana crushed Sierra Leone despite only making 115-9 off its 20 overs. However, 4-10 from Omar Ali destroyed Sierra Leone's batting as it was dismissed for 36 all out.
However, Sierra Leone recovered its form in the afternoon as it defeated Mozambique by seven wickets.
Rwanda won its first match of the tournament with a 26-run defeat of Malawi, who also lost to Swaziland by five runs, while Tanzania defeated Ghana by 22 runs.
The top two teams in this division will get promoted and take a step closer to the ICC World Twenty20 2012.