Ajax Cape Town made it two wins from two games, after they recorded a 2-0 victroy over Shumba FC on Friday afternoon.
Masilake Phohlongo converted from the penalty spot, before Juanito Manuel sealed the victory for the Urban Warriors late in the first half.
Bidvest Wits maintained their unbeaten start, despite being held to 1-1 draw by Chippa United.
The Chilli Boys took the lead in the first stanza, although the lead didn't last long, as Sibaya slotted home with what proved to be the final goal of the game in the 35th minute.
Mamelodi Sundowns remain winless in the tournament, after they drew 1-1 with Zesco United. Meanwhile, fellow Pretoria outfit, SuperSport United romped to a 3-0 win over AmaZulu.
In another all Premier Soccer League tie, Bloemfontein Celtic claimed their first three points with a 1-0 victory over the University of Pretoria.
English Premier League side, Swansea City, moved second in Group C, after they recorded a 2-0 win over Glenwegians FC.
Defending champions, Glenden United defeated Harmony Academy in the main game of the day, which took place in the evening. Milano United claimed a 3-0 win over Riverside, while Southampton FC and Juventus played out a 1-1 draw.