Bentleigh edged the Bergers 1-0 thanks to Jacob Alexander's 87th minute strike.

Meanwhile, 2017 runners-up Adelaide progressed to the last four with a 2-0 win at Leichhardt Tigers.

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Bentleigh Greens 1 (Alexander 87') Heidelberg United 0, Kingston Heath

After a tense 86 minutes, defender Alexander got forward and curled in his maiden goal for Bentleigh to give his side the lead.

Heidelberg came close to a leveller in the 91st minute with a mad goalmouth scramble.

APIA Leichhardt Tigers 0 Adelaide United 2 (Goodwin 71', Boland 80'), Leichhardt Oval

Melbourne Victory's conquerors Leichhardt pushed and pushed but were undone in the final 20 minutes by Marco Kurz's Reds.

Craig Goodwin opened the scoring in the 71st minute with a long-range screamer to maintain his record of scoring in every round of the cup this year.

Mirko Boland added a second nine minutes later with a free header from Isaias' set-piece delivery.