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The South African under-20 side surged into the semifinals of the IRB Junior World Championship on the back of a magnificent second half performance to beat England 28-15 at Cape Town Stadium on Tuesday night.
England led 3-nil after a dour first half, but the Baby Boks roared back with four second half tries to grab the bonus point win they needed to make the last four.
The first five-pointer came after William Small-Smith broke close to the halfway line.
Flanker Shaun Adendorff crashed over for the second and Pieter Steph du Toit then dived over next to the posts for the third.
Adendorff bagged the all-important bonus point try 10 minutes from time.
In Sunday's semi-finals at Newlands, the Baby Boks will play Argentina and four-time champions New Zealand will play Wales.