Ndabayithethwa Ndlondlo netted a brace, while Monde Mpambaniso and Edgar Manaka weighed in with a goal apiece for a one-sided victory at the Dr Petrus Molemela Stadium.
Gallant's were subsequently paired with Golden Arrows in their semis as Richards Bay were drawn to face Orlando Pirates.
Arrows overcame TS Galaxy 2-1 in their quarter-final clash, while Pirates beat Magesi 2-1, as Richards Bay saw off Durban City 3-1.
All the dates, venues and kick-off times will be announced by the Premier League.
The full semi-final draw:
Golden Arrows vs Marumo Gallants
Richards Bay vs Orlando Pirates
Stellenbosch head coach Gavin Hunt has likened teenage sensation Quwan Plaatjies to former Bafana Bafana striker Mark Williams after the youngster announced himself in spectacular fashion with a hat-trick on his senior debut.
Quwan Plaatjies marked his Betway Premiership top-flight debut with a hat-trick for Stellenbosch in their impressive 3-1 win over Marumo Gallants at Athlone Stadium on Friday night.
Orlando Pirates have added to their ranks with the signing of young Stellenbosch goalkeeper Dublin Boon.
We take a look a look at the five key talking points ahead of the weekend's PSL action with all 16 top-flight sides set to do battle in the 2026/27 Betway Premiership.
