The Olympic 10,000m champion Mo Farah has described his 5,000m heat as "difficult" this morning.
The British long-distance man claimed third place to guarantee automatic qualification for Saturday's final and admitted to tiredness afterwards.
Speaking to BBC Sport, the 29-year-old said: "Yeah it was pretty difficult, I'm pretty tired today.
"I kept getting caught, there was a lot of pushing and shoving going on, that's what happens in the heats, hopefully it will settle down in the final."
Saturday's race begins at around 7.30pm.