Japan's Sena Irie starts strongly and lands the better shots early on. She takes the first round against GB's Karriss Artingstall.

Dominant from Shelly-Ann Fraser-Pryce, she even has the chance to slow down coming up to the line.

She wins the semi-final in 10.73, with Switzerland's Mujinga Kambundji second.

But what about third place?

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

Daryll Neita is looking good.

She's raced well, she's kept composed and there's been no pressure on her. She's managed to do her race just perfectly.

It's brilliant.

The boxing is now under way, and you can watch Karriss Artingstall live by clicking on the boxing image above.

One more semi-final to go and we will have our our Olympic 100m final line-up.

Britain's Daryll Neita will be looking to make sure she's on that start line, but the one to watch is Shelly-Ann Fraser-Pryce, a woman who needs little introduction.

The 2008 and 2012 Olympic 100m champion could be first woman to win three titles, and just last month, became the second-fastest 100m athlete ever behind Florence Griffith Joyner.

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

I think it's just not there in terms of that sharpness that you would normally see [from Asher-Smith].

So, Dina had a great reaction to the gun but she should be ahead of Del Ponte on the other side of her because she is a better starter. She is ahead - but not as much as we would expect.

Then the second part, that ability to continue to stride and pick up power that you need at the end of the race in order to maintain that momentum just wasn't there.

Del Ponte was coming through and Dina was moving backwards. This is a problem.

Mike Costello
Athletics commentator on BBC Radio 5 Live

It could not be more dramatic as we go into the final semi-final!

There are two fastest loser spots available for the final.

At the moment, Dina Asher-Smith holds the second of those.

If the third-place finisher is quicker than Asher-Smith's 11.05, the Brit's 100m campaign is over.

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

I think Dina is race-light. It feels to me like she thinks she's a bit ring rusty.

She's not getting into her flow like we normally see her. She feeds off quick races, quick times - and she just doesn't have that unfortunately.

Let's not make excuses, she might get through - but she will be bitterly disappointed with that execution of that race.

We don't often see that from Dina.

While that's going on, there's GB interest in the boxing ring.

Karriss Artingstall watched her flat-mate Lauren Price guarantee a medal earlier. She did so herself on Wednesday and now it's time to see if she can keep alive her hopes of gold.

The British Army gunner, 26, will face Japan's Sena Irie, 20, for the chance to take on world champion Nesthy Petecio in the women's featherweight final.

Their semi-final bout is next up in the Kokugikan Arena.

Marie-Josee Ta Lou and Shericka Jackson of Jamaica pretty much ran that side by side.

Ivory Coast's Ta Lou takes the win in 10.79, Jackson also qualifying for the final.

Third place goes to Michelle-Lee Ahye of Trinidad and Tobago. Her time of 11.00 is quicker than Dina Asher-Smith's so she pushes the Brit down the pecking order for the fastest loser spots.

Asha Philip places last in the semi-final.

Right, let's see what happens in the second semi-final.

GB's Asha Philip is up in this one, as is Ivory Coast's Marie-Josee Ta Lou.

She ran the fifth-fastest time of the year in Friday's heats in Tokyo in a blistering 10.78.

Marlon Devonish
Former 4x100m gold medal medallist on BBC Radio 5 Live

There are so many different variables that can affect your preparation, is she in the right environment? The travel? It doesn't look like the Dina Asher-Smith we are used to.

Hopefully she can get into the final.

Mark Burt: Okay that wasn’t in the script. Dina didn’t seem to have a fifth gear.

Dennis Ethan: I hope Dina Asher Smith will make it to the final despite finishing third

Allison Curbishley
Athletics expert on BBC Radio 5 Live

I am not quite sure what to say... we needed Dina to step it up, we need another bar risen and it just wasn't there. I thought Dina would have Ajla del Ponte's edge.

It was almost like the old Dina, she didn't seem to have that power. I do think she might scrape through but it is difficult to regroup.

Colin Jackson
Two-time world 110m hurdles champion on BBC TV

Dina got out of the blocks really well compared to Del Ponte. But Del Ponte managed to hold her form the whole way.

Dina looked like she was reaching and I am wondering if the hamstring injury which made her pull out of Gateshead hampered her preparation, just a little bit of that endurance.

A great start from Dina Asher-Smith, but Elaine Thompson-Herah flies through to take the win in 10.76.

It's Switzerland's Ajla del Ponte who takes the second automatic qualification spot, and Asher-Smith is third.

That's not enough to guarantee a place in the final. She faces an anxious wait now to see if she gets a fastest loser spot...

On your marks...

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

Obviously Elaine Thompson-Herah is the favourite in this heat but the other two dangers [for Asher-Smith] are on the other side. So she's right in the middle of the two she has to contend against to get through to that final.

You don't want to be a fastest loser, you want to be right there. Elaine is going to be gone, so Dina is right where she needs to be by the two people she needs to contend with.

Dina Asher-Smith looks so relaxed, a little wave to the camera as she is announced to the empty stadium.

Lane five is empty, where Blessing Okagbare would have been...