They will play SuperSport United home and away in the semi-finals.
The Team of Choice competed well in the first half, showing great hunger in winning possession while also creating several chances on goal.
The first opportunity arrived in the 13th minute when Pogiso Sanoka headed a corner over the bar.
Sheldon van Wyk was then close to getting on the end of Evans Rusike’s 30th minute cross before a storming run by Denis Weidlich ended with the skipper blasting a shot into the side-netting.
Lebohang Maboe then brought out a sharp save from Sundowns keeper Kennedy Mweene on 44 minutes before the home side had their first chance as Khama Billiat fired wide in first half added time.
The Pretoria team were nearly ahead five minutes after the restart as Thabo Nthethe’s headed effort hit the woodwork.
But United were looking dangerous on the counter and they took the lead on 58 minutes when Rusike fired in a volley after a surging break by Siphesihle Ndlovu.
Sundowns came back looking for the equaliser, but Billiat sent a header wide while for the most part Downs found themselves up against a determined and well organised Maritzburg defence.
There were late chances for the Brazilians, but Team of Choice keeper Bongani Mpandle did superbly to save Hlompho Kekana’s free kick before Kekana blasted a guilt-edged chance over the bar as United held on for victory.
Sundowns: Mweene, Nthethe, Madisha, Morena, Langerman, Kekana, Vilakazi (Manyisa 73'), T. Zwane, Tau, Billiat (Lebese 80'), Zakri (Laffor 60').
Maritzburg: Mpandle, Fransman, Weidlich, Sanoka, Makaringe (Xulu 89'), Mekoa, Shandu, Ndlovu, Van Wyk (Kunene 60'), Maboe, Rusike (Fileccia 73').
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