Akani Simbine delivered a storming anchor run to take South Africas relay team from near the back of the field to a spot in the final of the mens 4x100m relay at the Paris Olympics.
With Benjamin Richardson out injured, the team had to reshuffle the order, taking starter Shaun Maswanganyi to the second leg on the back straight.
Schoolboy Bayanda Walaza started with Bradley Nkoana running the bend and 100m star Simbine in his usual anchor role, where he rocketed through the field to finish second in 37.94sec to secure a spot in Friday's final.
The final is at 7.47pm on Friday night.
Marion Fourie won her 100m hurdles repechage in 12.79 to advance to Fridays semifinals.
