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South Africa's double Olympic champion Caster Semenya has not lost over two laps since 2015.

The South African star continues to compete under question marks over her testosterone levels and the advantage they may give her in competition. IAAF research is currently in front of the Court of Arbitration for Sport to determine the eligibility of hyperandrogenous athletes like Semenya. She is a superb athlete to watch.

Also in the medal mix could be Francine Niyonsaba, American Ajee Wilson and Kenyan Margaret Wambui.

Sandra Perkovic has thrown four discus (disci?) within a metre of each other. Consistency of a champion.

Her second, and best, of 70.31m has her in pole position for gold once more.

Elvis Costello on the latest montage? Yes please.

Clear, clear, clear, clear.

It's over 2.32m for leader Mutaz Barshim who is fulfilling his promise so far. He's done 2.43m in the past...

Image source, Getty Images

Image source, Getty Images

Britain’s Lynsey Sharp made the final in controversial circumstances after she was initially disqualified for impeding American Charlene Lipsey when approaching the finish line. However, that decision was successfully appealed and she got through as a fastest loser in 1:59.47.

Next on track is the women's 800m. Possibly more tactics on display.

That final lap from Hellen Obiri was ludicrously good. I'll bring you the highlights ASAP.

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That's the end of the road for Robbie Grabarz, his coach has his head in his hands. His clearance of 2.25m leaves him in fifth.

No medal for the Olympic bronze medallist. Fine margins.

Brendan Foster
Olympic medallist and BBC commentator on BBC Two

Sixth place for Laura Muir in that company is exceptional. I think this young lady is going to win a gold medal in a significant event in the not too distant future.

Laura Muir is a fine sixth in her first major 5,000m final, with Eilish McColgan 10th.

Hellen Obiri's winning time of 14:34:86 may be 16 seconds outside of her PB but the first three laps were basically a walk.

Steve Cram
BBC athletics commentator on BBC TV

Superb piece of running - it's an emphatic win from Hellen Obiri.

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Almaz Ayana v Hellen Obiri. Ayana has not been able to shake the Kenyan WHO KICKS and my word that is superb! She takes 30m out of her rival in the blink of an eye...

Brendan Foster
Olympic medallist and BBC commentator on BBC Two

This is a baptism of fire for Laura Muir. It looks to me as if she has recovered well from that heat.

Laura Muir and Eilish McColgan remain a long way back from the athletes in third and fourth. But Muir is on the move. That middle kilometre has ruined a few pairs of legs.

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The gold and silver look like they have been decided. Almaz Ayana and Hellen Obiri are in a class of their own. They've done a 5:40 2km in the middle of the race. Shredding the field.

The camera has to zoom right out to get the chasing pack even in the same shot. Hellen Obiri and Almaz Ayana are almost 100m clear.

This is punishing, devastating pace. Laura Muir and Eilish McColgan are working so hard to stay in sight of third.

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Steve Cram
BBC athletics commentator on BBC TV

That second group are running for bronze - no doubt about it. The other two have gone. They are too good.

Robbie Grabarz has a second attempt at 2.29m - clips it!

Mutaz Barshim and Danil Lysenko are the only men over it. Grabarz is in third as it stands.

Almaz Ayana is going for it here but Hellen Obiri is staying with her. The world record of 14.11 is safe because of that slow first three laps. But this pace is frightening.

The main group has closed in on the second group. It's a 13-woman fight for the bronze.

Image source, Reuters