South Africa has four athletes doing duty on day nine of the IAAF World Championships in London on Saturday.
12:32pm: 4×400-metre relay heats (Heat two). The full squad is Caster Semenya, Justine Palframan, Gena Lofstrand, Wenda Nel, Ariane Nel and Zoe Engler, but on race morning no finality had yet been reached which four would line up. Indications were that Semenya would be rested, and that Nel, Palframan, Lofstrand and Engler would start.
What they need to do: Finish in the first three of the heat or be one of the next two fastest teams.