Nigeria, who have never finished higher than fifth in this event at the IAAF World Championships, emerged as a potential medal contender on Saturday morning s heats after an assured and emphatic win in the first of two heats.

Sixteen teams fought for lanes in the 4x400m final on Sunday night. Three top finishers from each of the two heats qualified automatically, while two more teams advanced to the final by time.

Presumably Matej Toth shook hands with some of his fellows before the start of the 50km road walk on Saturday morning. It would be some time before he would see any of them again.

When it comes to the 400m, Michael Johnson is special in so many ways.

Ashton Eaton remains on course to threaten his own decathlon world record in the defence of his world title.

The IAAF World Championships, Beijing2015 enters its penultimate day. And there are still many things to look forward to.