The recalled England fast bowler Steve Harmison took two wickets in successive balls to spark a South African collapse on the first day of the fourth and final Test at the Oval, where the Proteas made only 197.
South Africa already have a a winning 2-0 lead in the series and appeared to be heading towards a strong position after winning the toss when they reached 103 for one.
But Harmison then had South African captain Graeme Smith caught at deep backward square leg for 46 and fired in a 149kmh yorker to bowl Hashim Amla for 36 with his next delivery.
James Anderson followed up by taking three wickets as South Africa slumped to 132 for six.
