it's not just the africans. it doesn't matter where you come from but where you are on the worlds list! ritz went to low 13.20's this year? there are a lot of guys under 13.20 in the world, i.e. europeans too!
the thing that impressed me though was his big jump in pr. i thought it may be a smaller improvement as he was already a big mileage guy from hs. he's kept the miles the same and apparently cut down due to altitude but still taken a big bite off his pr!
if he can make a similar improvement in proportion to this year and go to say sub 13.15 and near 13.10 you yanks have my permission to get excited!
good luck ritz