Right wing Keenan Jacobs scored four tries as Bishops thrashed arch-rivals Rondebosch 52-14.
Hosts Rondebosch made the better start to the game with their forwards dominating. After all the early pressure, though, Bishops scored against the run of play when Jacobs regathered his chip kick over the tryline.
Bishops then piled on the pressure, but Rondebosch's defence stood firm. But poor handling again cost Rondebosh, when a dazzling Bishops counter-attack resulted in a converted try for left wing André Manuel.
All the defensive work Bosch put in earlier was then undone when Bishops' backline cut through them with some deft offloading and stepping for Jacobs to score either side of the break. Centre Corniel Smit added both conversions, stretching their lead to 28-0.
The Rondebosch players looked as shell-shocked as their supporters in the stands and Bishops took full advantage. First lock Justin Heunis ran 40m for an intercept try, before loosehead prop William Day hammered over the line from close range.
The hosts worked their way into Bishops' 22 nicely but failed to strike. They were caught on the counter yet again and the flying Jacobs was on the end of the final pass for his fourth and Bishops' seventh try. Rondebosch eventually scored two converted touchdowns, but not before conceding an eighth try and bragging rights to Bishops.
In other results, Wynberg beat SACS 10-0 in a drab affair in another traditional derby, EG Jansen humiliated Vereeniging 61-0, Menpopark recorded a 27-13 win over Eldoraigne, Pretoria Boys' thumped St Stithians 49-7 and Paarl Gymnasium egded Boland Landbou 25-23.
Rondebosch 14 Bishops 52
Wynberg 10 SACS 0
EG Jansen 61 Vereeniging 0
Menlopark 27 Eldoraigne 13
Pretoria Boys' 49 St Stithians 7
Paarl Gym 25 Boland Landbou 23
Paarl Boys' 26 Drostdy 10
Westville 11 Maritzburg 11
Selborne 28 Dale 7
St Andrew's 69 Muir 10
Michaelhouse 29 St Charles 17
Bellville 17 Tygerberg 66
By Mariette Adams
Photo: Peter Heeger/Gallo Images