Herschelle Gibbs and Jacques Kallis both hit centuries to give South Africa complete control of the third Test against West Indies on Monday.
Gibbs scored 142 and Kallis 130 not out as South Africa closed the penultimate day on 335 for three in their second innings, a lead of 440.
They look sure to declare overnight and attempt to dismiss West Indies in the 105 overs available to them on Tuesday.
It was the 12th Test century scored by Gibbs and the 14th for Kallis, the pair sharing a partnership of 251 for the third wicket before Gibbs holed out in the deep.
Although West Indies made a good start to the day, claiming the wickets of captain Graeme Smith (24) and Jacques Rudolph (nought) within the first three overs, Gibbs and Kallis steadied the innings before rain forced the players from the field an hour after lunch.
The pair returned to complete their centuries in the late afternoon, South Africa seeking quick runs in the 26 overs remaining to them in the day.
The home side are already 2-0 up in the four-match series.
Scoreboard:
South Africa first innings: 532 (M.Boucher 122 not out, J.Rudolph 101, N.McKenzie 76, J.Kallis 73; A.Sanford 4-132)
West Indies first innings: 427 (C.Gayle 116, B.Lara 115; A.Nel 5-87)
South Africa second innings: (overnight 38-0)
G.Smith b Edwards 24
H.Gibbs c Gayle b Sarwan 142
J.Rudolph c Jacobs b Drakes 0
J.Kallis not out 130
G.Kirsten not out 10
Extras (b-3 lb-7 w-8 nb-11) 29
Total (for three wickets, 76 overs) 335
Fall of wickets: 1-48 2-50 3-301
To bat: N.McKenzie, M.Boucher, S.Pollock, P.Adams, M.Ntini, A.Nel
Bowling: Edwards 14-0-86-1 (w-7 nb-3), Sanford 8-1-38-0 (w-1), Gayle 9-3-34-0 (nb-1), Drakes 20-0-68-1 (nb-7), Mohammed 6-0-30-0, Sarwan 19-1-69-1.
