GEORGETOWN - Paceman Pedro Collins took the key wicket of South African captain Graeme Smith before the close as the West Indies scented victory on the fourth day of the first test today.
South Africa, who followed on 355 runs behind, reached 85 for two in their second innings whenbad light ended play three overs early.
Jacques Rudolph was 19 not out with Jacques Kallis on one.
South Africa were dismissed for 188 in their first innings after the West Indies declared their first innings closed on 543 for five declared.
Smith was bowled off his inside edge for 34 by a swinging delivery from Collins 16 overs before the enforced close, ending his careful innings after 142 balls.
The three-man West Indies' pace attack shared nine wickets between them in South Africa's first innings.
Collins took three for 39, Daren Powell claimed three for 61, and Reon King picked up three for 48.
South Africa resumed their first innings on 130 for six, and they slipped to 158 for seven in the 14th over of the day when Nicky Boje was bowled off his pads by a straightening delivery from King.
Boje batted solidly for his 34 and his dismissal ended a steadying stand of 63 scored with Mark Boucher.
South Africa's last genuine hope of reaching the follow on target disappeared when Boucher drove at a wide delivery from Collins and was caught at first slip by Shivnarine Chanderpaul.
Boucher scored a defiant 41 off 158 balls with five fours.
The only low point of South Africa's first innings for the West Indies was the 31 no balls their attack bowled.
AB de Villiers and Smith opened South Africa's second innings three overs before lunch.
They batted cautiously until de Villiers dragged the sixth delivery after tea, bowled by King, on to his stumps to be bowled for 20.
South Africa might have been 62 for two, but Devon Smith at slip failed to hold a sharp chance after Rudolph, on two, edged a ball from Deonarine.
Smith's dismissal followed, and Rudolph was dropped again on 14 when left-arm spinner Ryan Hinds spilled a return catch.
