Olympic champion Peres Jepchirchir out of World Championships

Francine Niyonsaba and Olympic 400m champion Steven Gardiner have also scratched from Eugene this week

Francine Niyonsaba breaks 2,000m world record

Niyonsaba ends her season with a world record, running 5:21.56 at the Continental Tour meet in Zagreb, Croatia

Francine Niyonsaba smashes Olympic standard in second-career 5,000m race

Just a week after running her 5,000m debut, the Olympic 800m silver medallist ran an amazing 14:54.38 in France