Cape Town - Bloemfontein Celtic proved the architects of their own downfall at the MultiChoice Diski Challenge after a Enoch Phungwula own-goal gave Mpumalanga Black Aces a 1-0 win.
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Sunday's quarter-final encounter produced plenty of chances, although both teams proved largely wasteful in the opening 45 minutes as they entered the half-time break still goalless.
Things almost changed after the restart as Vuyani Ntanga danced through the Aces defence before hammering a shot at goal, but Cyril Mollo was equal to the effort and managed to turn the danger behind.
Aubrey Ngoma's introduction gave Clive Barker's men a big boost and the substitute came close to having an instant impact, only to see his rasping drive thwarted by the goalkeeper, while Thabo Nodada could only fire over after connecting with the resulting corner.
However, with five minutes remaining at the King Zwelithini Stadium, Aces finally found a way through, albeit in fortunate circumstances as Phungwula headed past his own goalkeeper to give the Mpumalanga-based side their ticket to the semi-finals.
Aces will now head into the semi-finals, along with SuperSport United, University of Pretoria and Mamelodi Sundowns.