Rediff.com's Day 4 guide to Moscow World Athletic championships.
Wayde van Niekerk ran the fastest 400 metres since 2007 to become the first South African to win a World Championship sprint title on Wednesday.
Usain Bolt returned to the scene of his triple Olympic glory and duly delivered for 60,000 camera-flashing fans as he overcame a slow start to win the 100 metres and give the London Anniversary Games the Friday finale it demanded.
A round-up of all the results from the 17th World Athletic Championships in London