Woodman also chipped in with another brace as New Zealand showed no mercy to an Irish team who had earlier eliminated England 19-14 in the first round.
They are now due to face the challenge of England, who battled to a tightly fought 19-15 win over Samoa. The stage is set for a very special and innovative tournament - the biggest Rugby World Cup Sevens, the most digitally-engaged, most viewed, and we hope the most competitive Rugby World Cup Sevens to date.
New Zealand will play the United States in Saturday's semi-finals.
The Blitzboks have been brilliant so far.
Seven women's players from five countries will enter the pitch in San Francisco to make their third Rugby World Cup Sevens appearance: Beatrice Muhlbauer (Brazil), Claire Allan and Heather Fisher (England), Fanny Horta (France), Zenay Jordaan (South Africa) and Marina Bravo and Barbara Pla (Spain).
This time it was Michaela Blyde's turn to get in on the try-scoring with a well-taken hat-trick.
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"The guys on my inside did all the work. We want this team to create its own history and legacy", said Mikkelson. But the coaches decided on a training session earlier in the day and that helped us prepare, so we were ready for Ireland.
"We can take a lot of confidence from our performance in Paris and we've had a boost with a couple of players returning from injury so we're really happy with where the squad is at the moment".
OIympic champions Fiji were sensational in beating Argentina 43-7.
New Zealand, meanwhile, were anything but impressive as they scraped past France 12-7 to progress.
Three first half yellow cards saw the All Blacks Sevens playing with only six men for the majority of the half and trailing 7-0 at the break. They will have to be considerably better to get past Fiji.
Their semi-final opponents New Zealand have also won two World Cups and would edge into the outright lead with a win, while South Africa have never won even one. They will meet the United States of America in their semi-final on Sunday morning.