Amos continues to haunt 800m world record holder Rudisha

The 800m was once such a simple puzzle for David Rudisha and it used to have such a simple solution. Glide into the lead from the gun, shake off opponents as smoothly as dust from silk and humbly accept the crowd’s appreciation of your athletic genius. Which made it slightly rueful to watch the great Kenyan scratching his head at the Anniversary Games after another defeat at the hands of the brilliant Botswana's Nijel Amos.

It is becoming a recurring theme. Since striding gloriously away from the field at the London 2012 Olympics in a world record time of 1min 40.91sec Rudisha has met Amos six times. And he has lost every single race.