Dame Jessica Ennis-Hill
London 2012 Olympic heptathlon champion on BBC TV

One of the hardest things is when you are stood there and you don’t know the reason why.

Dina felt in good shape, been doing well in training, had good indications but she couldn’t put her finger on what the problem was.

Dina Asher-Smith to BBC Sport: "I'm just disappointed because I'm in great shape and have been in great shape all season, I fully expected to make that final, the race wasn't even fast.

"I know I'm in a lot better shape than that...yeah.

"I just go on to the 200m, but again I'm fully disappointed. I should have made that."

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

Out of the blocks she looked very, very tight.

Look, I saw her run earlier this year and she didn't look like this. Something is happening where she is not moving forward as we expected.

This race wasn't exactly fast.

Katherine Merry
Olympic 400m bronze medallist on BBC Radio 5 Live

Dina Asher-Smith is not in a top two qualifying spot for the final.

For the second Olympics in a row, the British record holder leaves the Olympic stage in the 100m event at the semi-final stage.

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

Image source, Getty Images

Dina will be bitterly disappointed. She knew this was going to be a tough challenge of course, all semi-final are loaded but she didn’t get in contention early.

She got a reasonable good start but she didn’t get on terms.

She will not be in that final, She’ll be really frustrated.

Dame Denise Lewis
Athens 2000 Olympic heptathlon gold medallist on BBC TV

It's not the Dina we're used to seeing, she will be bitterly disappointed. The whole demeanour is something we're not used to.

It's American Melissa Jefferson who crosses the line first, with a time of 10.99 seconds.

Marie-Josee Ta Lou, of the Ivory Coast, is through in second.

Dina Asher-Smith has a slow start and she can't recover, coming in fifth. The British sprinter is out.

Katherine Merry
Olympic 400m bronze medallist on BBC Radio 5 Live

The big question is, who is it going to [win the 100m]? Will it be Sha'Carri Richardson? She looked great yesterday in the heats.

But we have to get through the semi-finals first. We've got three Brits in action with Imani Lansiquot, Dina Asher-Smith and Daryll Neita all hoping to make that electric final later on.

After that big news, we're ready for the first women's 100m finals.

Can Dina Asher-Smith make it into the Olympic final?

Remember, only a top two finish will guarantee a place in the showpiece.

Dame Jessica Ennis-Hill
London 2012 Olympic heptathlon champion on BBC TV

That's really sad - for Shelly-Ann Fraser Pryce not to be able to complete the series in the way she wanted to - she will be devastated.

We're not sure what the reason is for Shelly-Ann Fraser-Pryce pulling out, but we'll bring you any updates as soon as we get them.

Breaking news for the women's 100m!

We've just heard that Jamaica's Shelly-Ann Fraser-Pryce is out.

The two-time Olympic 100m champion will not compete in the semi-finals.

Image source, Getty Images

You may have noticed little two or three-letter abbreviations next to an athlete's score or time during this first week of the Olympics.

Now the athletics has begun, you are certainly likely to see them quite often. So, for the uninitiated, here is a quick guide to what they all mean...

WR: World record

OR: Olympic record

NR: National record

PB: Personal best

SB: Season's best

DNF: Did not finish

DQ: Disqualified

China's Zheng Qinwen claimed the biggest win of her career at Roland Garros this afternoon, beating Donna Vekic of Croatia in straight sets to become the Olympic women's singles champion.

Watch the best moments from the world number seven's 6-2 6-3 win...

We're just 10 minutes away from the first 100m semi-final gets under way.

GB's Dina Asher-Smith goes in that one and will face tough competition from Marie-Josee Ta Lou.

The sprinter from the Ivory Coast posted the fastest time of the heats, running 10.87secs to edge Jamaica's two-time Olympic 100m gold medallist Shelly-Ann Fraser-Pryce (10.92).

There will be three semi-finals before we know who our women's 100m finalists are.

The two fastest athletes in each semi-final will make it to the Saturday night showpiece, while the next two fastest athletes will also advance to complete the eight strong line-up.

Image source, Getty Images

With just over 10 minutes to go, World Cup winners Spain looked to be heading out, but two late goals have seen them take their quarter-final match with Colombia to extra-time.

Colombia had taken a two-goal lead through Mayra Ramirez and Leicy Santos, but in the 79th minute Jennifer Hermoso got Spain back into it.

Then, seven minutes into added on time, captain Irene Paredes put away the equaliser to give her side another 30 minutes to keep their Olympics hopes alive.

In the third quarter-final of the day, Canada and Germany are currently goalless in the first-half.

Advantage Lorenzo Musetti in the early stages of the bronze medal match at Roland Garros - the Italian leads Felix Auger-Aliassime 2-1 with a break of serve.

Musetti needed five break points to get the job done in the opening game of the match.

BBC iPlayer

Judo fans - get iPlayer on, where you can see French legend Teddy Riner in the mixed team final.

Settling in for a night of athletics? This is the full programme for this evening's action at the Stade de France...

18:10 - Men's decathlon javelin (group A)

18:15 - Men's 1,500m repechage round

18:35 - Men's shotput final

18:50 - Women's 100m semi-finals

19:00 - Men's decathlon javelin (group B)

19:20 - Women's triple jump final

19:55 - 4x400m mixed relay

20:20 - Women's 100m final

20:45 -men's decathlon 1,500m