Opener Mohammad Rizwan hit a sparkling 79 as Pakistan scored an imposing 189-2 from their 20 overs at Sheikh Zayed Stadium in Abu Dhabi.

Babar Azam was also in superb form as he smashed 70 to guide Pakistan to their fourth consecutive win and a place in the last four of the tournament.

Pakistan's total proved insurmountable for Namibia but they produced a spirited display on their way to reaching 144-5.

Babar's team sit top of Group 2 on an unbeaten record and now cannot be passed, with New Zealand, Afghanistan and India battling to join them in the next round.

Pakistan had made a sluggish start to their innings and were 59-0 at the halfway stage before they accelerated in their last 10 overs, thanks to the brutal hitting of Rizwan, Azam and Mohammad Hafeez, who struck 32 from 16 balls.

Chasing an improbable 190 to win, Namibia did string together decent partnerships but fell comfortably short of their target.

In the day's earlier game at the same venue, South Africa cruised to a six-wicket victory over Bangladesh to boost their chances of qualifying for the semi-finals.

South Africa ripped through the Bangladesh line-up, bowling them out for 84 to set up an easy victory.

Anrich Nortje led the South African attack with 3-8 as Bangladesh slipped to 24-3 and then 45-6 before being skittled with 10 balls to spare.

South Africa themselves stumbled at 33-3 but regained their composure to record a straightforward win.

The Proteas are second in Group 1 behind unbeaten England and have a better net run rate than Australia in third.

South Africa conclude their group stage campaign against England on Saturday (November 6).