Port of Spain - Fast bowler Dale Steyn grabbed 5-29 and Morne Morkel took 4-19 as South Africa blew away West Indies for 102 to take a firm grip on the opening Test on day three Saturday.
The hosts, replying to South Africa's 352, conceded a first innings lead of 250.
Only three batsmen reached double figures with Narsingh Deonarine topscoring with 29. Shivnarine Chanderpaul contributed 26 and Denesh Ramdin an unbeaten 25.
South Africa, opting not to enforce the follow on, reached 18 without loss in its second innings by tea.
Chanderpaul and Deonarine shared a stand of 59 for the fourth wicket to repair the early damage caused by Morkel at 12-3.
But once Chanderpaul fended a Steyn bouncer to wicketkeeper Mark Boucher, the innings subsided dramatically with six wickets tumbling for four runs in 28 deliveries.
Dwayne Bravo (1) also fended to Boucher to give Morkel his fourth wicket.
Steyn then took over with some quality, fast swing bowling.
Deonarine misjudged an inswinger and lost his off stump as he played no stroke.
The tail was no match for Steyn as Shane Shillingford was leg before first ball, and Suleiman Benn (0) and Rampaul (0) had their stumps rattled.
Steyn, in his 39th Test, passed 200 career wickets during his spell, becoming the fourth fastest to the milestone after Australians Clarrie Grimmett (36), Dennis Lillee (38) and Pakistani Waqar Younis (38).
Ramdin and Nelon Pascal dragged the innings past three figures in a last stand of 27.
Ramdin struck four fours but Pascal eventually skied a pull to midwicket to end the innings.
Smith opted not to enforce the follow on and the South Africans stretched their overall lead to 268 by the interval.