Mandurah City will take on Subiaco while Olympic Kingsway will face UWA Nedlands in the semi-finals of the Men's State League Night Series.
The four sides progressed from the weekend's last-eight ties, two of which went to penalties.
On Friday, Mandurah went through with a 2-1 win over holders Western Knights at Crazy Domains Stadium.
This was followed by a 4-1 win for UWA Nedlands over hosts Forrestfield United, with Rhys Williams, Pascal Sedwick, Adam Carlino and Samuel Moffat the scorers for UWA.
The two games at Wanneroo on Saturday both went to penalty shoot-outs.
First, Olympic Kingsway defeated Fremantle City after the teams had drawn 2-2 after 90 minutes.
It was a thrilling opening. Chris Rizidis had last season's runners-up Kingsway in front on three minutes; 60 seconds later it was 1-1 thanks to Hayden Stevens' equaliser. By half-time Fremantle were ahead through Adriano Jelenovic, only for Luke Rhodes to take the tie to penalties with Kingsway's second 14 minutes from the end.
The last quarter-final between Wanneroo City and Subiaco was also decided via spot-kicks and for the second night in succession there was disappointment for the host team as Wanneroo crashed out following a 1-1 draw.
Because of this weekend's FFA Cup ties, the semi-finals will take place on Wednesday week (March 24) at Macedonia Park.
State League Night Series Semi Finals
Date: Wednesday 24 March
Venue: Macedonia Park
Olympic Kingsway vs UWA Nedlands (6.30pm)
Mandurah City vs Subiaco (8.30pm)