Lahti was broken by the heat

- It was very tough.

It felt pretty good the first 3.5 kilometers but then the heat took its toll.

It was a tough last 1.5 kilometers.

I would have liked to run a little faster than this, says Lahti to SVT Sport after being tenth in the heat.

- I chose 5000 meters because I thought 10 kilometers would be too hot but it was just the opposite, says Lahti, whose personal record is 15.04.87.

A moment later, the heat's most noticed participant, Caster Semenya, ran to the finish line in 15.46.12.

Due to too high innate testosterone levels, she is forbidden to compete on distances between 400 and 1500 meters in championships. 

Gudaf Tsegay, who finished second in the 1500 meters, controlled the race and won in 14.52.64 just ahead of his Ethiopian compatriot Dawit Seyaum.