De Jager so na ndị otu South Africa n'asọmpi 4x400 mita na 2012 Summer Olympics
Ọ dị mma. N'agba nke mbụ, Ofentse Mogawane dara ma gbawaa ubu ya mgbe ya na onye Kenya bụ Vincent Kiilu na-agbakọ, nke mere ka South Africa pụọ n'asọmpi ahụ. A gafere South Africa n'asọmpi ikpeazụ ahụ mgbe ha rịọrọ ndị IAAF arịrịọ, n'ihi nnyonye anya nke onye egwuregwu Kenya nke meriri Mogawane. E kenyere ha ahịrị nke itoolu ma mechie n'ọnọdụ nke asatọ na oge kachasị mma nke oge 3:03.46.