AB de Villiers and Hashim Amla blasted South Africa to victory by nine wickets after England collapsed in the second T20 international at the Wanderers Stadium on Sunday.
De Villiers and Amla made England's total of 171 look puny as they thrashed 125 runs in a 55-ball opening stand. Villiers, on the ground on which he hit the world's fastest one-day international century against the West Indies, thrashed 79 off 29 balls with six fours and six sixes.
On the way he reached his fifty off 21 balls, the fastest for South Africa.
Amla was slightly more restrained but played some powerful strokes in making 69 not out off 38 balls with eight fours and three sixes.
The ease of South Africa's win, which completed a 2-0 series victory, did not look a possibility while England captain Morgan and Buttler were pounding sixes in a fourth wicket stand of 96 runs.
England had reached 157 for three and seemed set for a total well in excess of 200.
Brief Scores
SA: 172/1 (de Villiers 71, Amla 69*) beat Eng: 171 (Buttler 54) by nine wickets.