South Africa's double Olympic champion Caster Semenya progressed without problem to the final of the women's 800m after coasting to victory in the semi-final at the IAAF World Championships on Friday.
Francine Niyonsaba once again had to settle for second place behind Semenya, herself running a very fast time of 1:55.92, with Ajee Wilson capping off an impressive season to finish in third place in a time of 1:56.65.
The South African, who had already taken a bronze medal in the 1500-meters, did not find things easy but proved far too strong down the back straight and became the eighth fastest woman in history with her new national record.
The eventual medalists were well ahead of the rest of the field, with Margaret Wambui nearly a second behind Wilson to finish in fourth.
Semenya, however, maintained her languid stride a few metres back before closing the gap, easing past both on the final bend and running clear.
Semenya, who stands to be awarded the 2012 Olympic gold medal after Russian victor Mariya Savinova was disqualified for doping, now has to await further meetings between the IAAF and CAS to discover if she again has to take testosterone suppressing medication.
Kenya's Margaret Wambui, bronze medallist at both the world indoors and Olympics a year ago, won that heat, but Arzamasova's season's best of 2:01.92 was not fast enough to see her bag one of the faster loser places.
Has anyone - aside from her predecessors long suspected of benefiting from chemical enhancements - ever made one minute 55.16 seconds look so effortless?