Martin du Toit claimed a brace of tries as the Southern Kings inflicted a surprise first defeat of the Pro14 season on Glasgow Warriors and Leinster hammered Edinburgh on Saturday.
Conference A leaders Glasgow arrived in Port Elizabeth with three wins out of three, but suffered a 38-28 defeat at the Nelson Mandela Bay Stadium after finding themselves 31-0 down early in the second half.
Du Toit touched crossed the whitewash in both halves, while Yaw Penxe, Rudi van Rooyen and Harlon Klaasen also dotted down in a first win of the season for the South African outfit.
Masixole Banda finished with a 13-point haul as the Kings pulled off a surprise win, with tries from Nick Grigg, DTH van der Merwe and Fraser Brown in vain for the Warriors.
Leinster top Conference B following a 31-7 bonus-point drubbing of Edinburgh in captain Johnny Sexton's 150th appearance for the champions.
Ireland fly-half Sexton marked the occasion by scoring one of five tries - three of which he converted - for Leo Cullen's rampant side, with Pierre Schoeman sent off for an Edinburgh side that sit bottom after he was deemed to have led with his elbow running into contact.
Connacht were 33-20 winners over the Scarlets, while the Dragons saw off Zebre 16-5 and the Ospreys beat Benetton Treviso 27-10.
