Golden Lions cruised to a comprehensive bonus-point win 46-8 over the Griquas, running in six tries in Kimberley.
Jaco Kriel scored two tries in the thrashing, with Ruan Combrinck finishing with a personal haul of 21 points as he added five conversions and two penalties to his late try.
Scoring six tries altogether and bagging the maximum five points in the process, the Lions look set for a home semi-final and possible final in Johannesburg.
Full-back Andries Coetzee got the Lions on the scoreboard with his try in the 12th minute, which winger Combrinck converted to help give his side a seven point lead.
Combrinck was again called to action a couple of minutes later to kick a penalty and repeated the feat five minutes from half-time.
Two minutes from the break Griquas full-back Gouws Prinsloo kicked a penalty to notch up the first points for his team as the sides headed to the interval with the score 13-3 in favour of the visitors.
Lions flanker Kriel scored a try in the 48th minute with Combrinck converting to stretch the lead even further.
What followed was four more tries by the Lions, with lock Franco Mostert, replacement back Albertus Smith and Combrinck adding to the tally.
Flanker Kriel also scored his second five pointer of the afternoon, not only helping the Lions stamp their authority on the game.
Amid the steady flow of Lions tries, Griquas did manage to get one back, with flanker Carel Greeff going over in the 68th minute, but there was little joy for the Peacock Blues with their participation in next year’s qualifying round becoming a reality.
For Golden Lions:
Tries: Coetzee, Kriel 2, Mostert, Smith, Combrinck
Conversions: Combrinck 5
Penalties: Combrinck 2
Griquas: 15 Gouws Prinsloo, 14 Ederies Arendse, 13 Johnathan Francke, 12 Wayne Stevens (c), 11 PJ Vermeulen, 10 Dean Grant, 9 Tian Meyer, 8 Carel Greeff, 7 Jaco Nepgen, 6 Ruaan Lerm, 5 Hugo Kloppers, 4 Hilton Lobberts, 3 Maks van Dyk, 2 Martin Bezuidenhout, 1 Janro van Niekerk.
Replacements: 16 Ryno Barnes, 17 Simon Westraadt, 18 RJ Liebenberg, 19 Marnus Schoeman, 20 Abrie Griesel, 21 Jacquin Jansen, 22 Danie Dames.
Lions: 15 Andries Coetzee, 14 Ruan Combrinck, 13 Lionel Mapoe (c), 12 Howard Mnisi, 11 Courtnall Skosan, 10 Jaco van der Walt, 9 Ross Cronje, 8 Willie Britz, 7 Warwick Tecklenburg, 6 Jaco Kriel, 5 Franco Mostert, 4 Martin Muller, 3 Ruan Dreyer, 2 Armand van der Merwe, 1 Jacques van Rooyen.
Replacements: 16 Robbie Coetzee, 17 Schalk van der Merwe/Julian Redelinghuys, 18 Derick Minnie, 19 Kwagga Smith, 20 Mark Richards, 21 Marnitz Boshoff, 22 Stokkies Hanekom.
Date: Saturday, September 27
Kick-off: 15:00 local (14:00 BST, 13:00 GMT)
Venue: GWK Park, Kimberley
Referee: Jaco Peyper
Assistant Referees: Oregopotse Rametsi, Jan Venter
TMO: Jason Jaftha