Another fabulous day at the Bird's Nest and almost every story unfolded as the majority of people would have wished. There were tears from Katarina Johnson-Thompson after her heptathlon hopes ended in the long jump, but Jessica Ennis-Hill recaptured heptathlon gold, while Usain Bolt reminded us just what a special human he is. 

You can watch the 100m final - and Ennis-Hill winning gold - again on this website, while the day's highlights will also be online and on BBC Two from 19:00 BST so join Gabby Logan, Michael Johnson and Daley Thompson for that. 

That's all from us. Thanks again for your contributions. Until tomorrow...

Ed Taylor:  He might not have explicitly said it but I think Bolt fully understood the importance of needing to win that 100m.

Lauren Jayne:  So happy for @usainbolt, external He had me soooo nervous!! #Beijing2015, external#bbcathletics, external

Mike Costello
BBC Radio 5 live athletics commentator

"Hopefully there will be more to come with the 200m for Usain Bolt later in the week. He could dominate these championships and that would be very welcome for anybody with a semblance of feeling for this sport."

Image source, Reuters

Darren Campbell
Former British sprinter on BBC Radio 5 live

"We are all happy now and that's the important thing. The sport needs to sort itself out and we have that opportunity to start from a positive position thanks to the great Usain Bolt."

"The experience of hearing that national anthem while you're on the podium is one of the things that motivates me each day in training.

"What really drives me on is winning medals and getting records. To be called one of the greatest you've got to win Olympic titles, I've done that and I just want to keep enjoying my sport.

"I'm feeling a little bit tired to be honest, but that happens after a race like that. It was emotional. I've got three days to recover before the 5000m, then I'l go out and give 100 per cent. I'm enjoying it here, there's a great team spirit here, I'll keep smiling and keep doing what I'm doing."

Image source, Reuters

Here's what world champion Mo Farah had to say earlier about his 10,000m victory: 

"It's been a long season and it's important to do what I do, and to represent my country and to win medals. I enjoyed it last night, it was hard but I dug in deep and worked it out with the right tactics. It was great to get the country started with a first gold medal of the championships.

"Every medal is different and for me, I enjoy winning medals for my country this one is more enjoyable because it's been a hard season. It would have been nice to have my family here with me, but that wasn't possible because my wife is expecting." 

Val Renwick:  Dedication & determination is winning a gold medal 13 months after having a baby #bbcathletics, external#jessicaennis, external

Paul Withers: @J_Ennis, external Massive congratulations Jess! Incredible achievement! You've done GB so proud!

Luke Rundle:  This men's shot put final is incredible

A second gold for Britain means the team are top of the medal table at the end of the second day. Gold for Mo Farah, gold for Jessica Ennis-Hill. Nothing much has changed since 2012, has it?

Image source, BBC Sport

Michael Johnson
BBC Sport athletics expert & 400m world record holder

"It's her balance of emotions, she is able to keep everything in perspective and be competitive without being overly-aggressive, because that can hurt you. How you control your emotions is a big part of that, and younger athletes have to learn that skill."

Michael Johnson
BBC Sport athletics expert & 400m world record holder

"That would be an incredible story for her to come out with a medal in the long jump, having had a poor performance in the heptathlon. She's missed an opportunity in the heptathlon here but she can rectify things in the long jump later this week."

What a day for track and field. Two popular victories, two remarkable stories of greats coming back and proving their greatness. Feel free to watch Jessica Ennis-Hill secure her heptathlon gold...

Tom:  As if Bolt was ever gonna lose! Nice to see the legend won.

Paul Wright:  Watching a re-run of Jess Ennis-Hill final event. I know she wins but Im still getting the goosebumps!!

Rhosyn Morgan-Davies:  So happy Bolt won. This was about more than him winning another gold medal.

1 Usain Bolt (Jam) 9.79 secs; 2 Justin Gatlin (USA) 9.80; 3 Andre De Grasse (Can) & Trayvon Bromell (USA) 9.92

5 Mike Rodgers (USA) 9.94; 6 Tyson Gay (USA) 10.00; 7 Asafa Powell (Jam) 10.00; 8 Jimmy Vicaut (Fra) 10.00; 9 Bingtian Su (Chn) 10.60 

Image source, AFP

Daley Thompson
Two-time Olympic decathlon champion on BBC TV

There's only one man cheeky enough to tease Michael Johnson...

Dennis:  Dear world don't ever ever ever, doubt a true champion! Well done Bolt.

Victor:  Liking the banter between the pundits, Daley and Johnson.

Adam Puddy:  Usain Bolt is just boss.

If you want to watch Bolt winning his third 100m title again - and why wouldn't you - you can do so by clicking here. It was a dramatic 9.79 seconds which reminded us why we love sport, and why we love athletics.