South Africa held their collective nerve to edge West Indies by three wickets under the Duckworth-Lewis method in a rain-disrupted shootout for a semi-final spot at the Twenty20 World Cup in Antigua.
The unbeaten Proteas joined England in the last four as Group 2 winners when Marco Jansen (21 not out) smashed a six down the ground off the first ball of the final over to get South Africa to their adjusted target of 123.
Left-arm spinner Tabraiz Shamsi had earlier taken 3-27 as tournament co-hosts West Indies were restricted to 135-8 before the rainstorm swept in to stop play.
Spinner Roston Chase (3-12) took three wickets late in the South African innings to set up a dramatic finish and give a glimmer of hope that West Indies might keep alive their quest for a third title.
"There's a lot of relief ultimately to get through to get to the semi-final," said South Africa captain Aiden Markram.
"I suppose it's been the story of our (tournament), get ourselves into tricky positions and sort of by hook or by crook get over the line."
The other two semi-finalists will be decided on Monday when India and Australia meet in St Lucia and Afghanistan take on Bangladesh in St Vincent in the last two matches in the Super Eight stage.
Sherfane Rutherford struck an unbeaten half-century and Gudakesh Motie produced a brilliant display of spin bowling as West Indies thumped England by 30 runs in a Twenty20 World Cup Group C encounter on Wednesday.
Australia launched their Twenty20 World Cup campaign with a commanding 67-run victory over Ireland in Colombo on Wednesday, powered by four-wicket hauls from Nathan Ellis and Adam Zampa.
Tottenham Hotspur have sacked manager Thomas Frank after eight months in charge, the Premier League club said on Wednesday, after a woeful run of results left the north London club hovering five points above the relegation zone.
South Africa survived Kagiso Rabada's final-over meltdown against Afghanistan and then a double Super Over drama before prevailing in a heart-stopping Group D match of the Twenty20 World Cup on Wednesday.
Pakistan opener Sahibzada Farhan has hit a swift half-century as the 2009 champions comfortably beat the US by 32 runs on Tuesday, clinching their second straight Group A win in the Twenty20 World Cup.