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

Rebecca Adlington
Double Olympic gold-medal winning swimmer on BBC TV

Image source, Getty Images

Bobby Finke has already been on the podium.

I loved the way he swam it, he went out hard. Daniel Wiffen wanted to go for that world record as well but it probably just surprised him how much Bobby just went for it straight away.

Bobby's turns were beautiful, as well as his big kick off the wall. He replicated the speed down that last 100m.

It was him against the clock, he knew that he had got that medal and I think he really really wanted that world record and this place erupted.

Karen Pickering
Swimming & diving expert on BBC Radio 5 Live

I feel for Daniel Wiffen because he will have that disppointment that he wasn't in the mix for the gold in the closing stages, but in a few hours or days he will look back and know it was a wonderful experience. And he is still an Olympic champion.

18:05: Men's 400m round one (including GB's Matthew Hudson-Smith and Charles Dobson).

18:55: Women's high jump final.

19:05: Men's 100m semi-final (including GB's Louie Hinchcliffe and Zharnel Hughes).

19:30: Men's hammer throw final.

19:35: Women's 800m semi-final (including GB's Phoebe Gill, Jemmie Reekie and Keely Hodgkinson).

20:10: Men's 1,500m semi-final (including GB's Josh Kerr, George Mills and Neil Gourley).

20:50: Men's 100m final.

BBC iPlayer

Tonight's athletics programme is about to get under way, starting with the first round of the men's 400m.

Want to watch? You can tune into BBC iPlayer now.

Harry Poole
BBC Sport in Paris

It's a glorious Sunday evening in Paris. Surely we will not see a repeat of last night, when the heavens opened before the women's 100m final.

It looks and feels like perfect conditions for some rapid times as the conclusion of the men's 100m is played out. Always one of the most anticipated events at any Olympics, expect plenty of drama throughout the semi-finals and final.

What a night to have a ticket for. The trains are rammed as thousands flock to the Stade de France from central Paris, and there is a real buzz of excitement as fans make the walk to the stadium

The stadium announcers and DJ are up to their usual tricks, getting the crowd involved in singalongs and also getting the French fans pumped by showing the latest medal table on the big screen.

The medal ceremonies are under way before the Sunday night action begins with the men's 400m heats, with big cheers for each medal winner as they get their moment in the limelight.

The stage is set for another blockbuster night of athletics. But who will be celebrating on the purple track as they cross the finish line later?

Karen Pickering
Swimming & diving expert on BBC Radio 5 Live

A last gasp men's gold medal in the pool for the United States of America and Bobby Finke has done it in such style. It was made all the more beautiful by Gregorio Paltrinieri and Daniel Wiffen putting in the yards at the start and racing so hard.

• Novak Djokovic beat Carlos Alcaraz in the final of the men's tennis singles.
• It was silver for GB in the men's golf, where Tommy Fleetwood was runner-up to USA's Scottie Scheffler.
• Great Britain shooter Amber Rutter won a silver medal in the women's skeet.

• Team GB won a fifth equestrian medal as Lottie Fry claimed bronze in the dressage individual final.
• GB's Harry Hepworth won bronze in the men's vault final.
• GB were knocked out of the men's hockey quarter-finals by India.
• Dina Asher-Smith, Daryll Neita and Bianca Williams have qualified for the women's 200m semi-finals.
• GB's Jacob Fincham-Dukes has qualified for the men's long jump final.
• Tade Ojora is through to the men's 110m hurdles semi-finals.
• Lina Nielsen progressed to the women's 400m hurdles semi-finals but Jessie Knight must compete in the repechage round.
• Tom Hall is out of the men's archery after losing 7-3 to Germany's Florian Unruh in the round of 16.

Andy Jameson
Commentator and former Olympic swimmer on BBC TV

Bobby Finke wins gold and he has broken the world record!

That is a brilliant swim, that is a gutsy swim.

I am so, so pleased for Finke. What a race that was.

Steve Parry
Olympic bronze medal swimmer on BBC Radio 5 live

How on earth has Bobby Finke done that? He has completely turned his race plan on its head. He normally goes out slow and hangs on to the lead, hitting in the final few laps, but from the moment he got in the pool he was racing. He looked like he was spriting the 1500 metres.

That was an incredible pace from the outset by America's Bobby Finke.

Victory never looked in doubt but a new world record was touch and go for a moment.

The record time of 14:31.02 seconds set by China's Sun Yang at London 2012 is no more.

Finke touches the wall in 14:30.67 seconds.

Alistair Bruce-Ball
Commentator on BBC Radio 5 Live

Daniel Wiffen has a lot of work to do here. Bobby Finke of Team USA is taking this out and Gregorio Paltrinieri is in pursuit. Wiffen is a good seven metres off the pace here.

What does Bobby Finke have left in the tank for final 200m?

He is 2.31 seconds clear of world record pace at this stage.

Remarkable.

Steve Parry
Olympic bronze medal swimmer on BBC Radio 5 live

I think Daniel Wiffen is swimming this race in 500 metre stints. he has gone fairly slow on the first one and I would like to see him build into it. Bobby Finke does have quite a sizeable lead already at this stage.

We are witnessing something very special here from Bobby Finke.

Second-placed Gregorio Paltrinieri is also ahead of the current world record time but he's trailing Finke by a full body!

300m to go.

Steve Parry
Olympic bronze medal swimmer on BBC Radio 5 live

Like a 10,000 metres on the track this race is the best one on the pool programme at this level. It is so tactical. These guys are in absolute agony already, their lungs will be bursting and their arms will be getting heavier with each stroke.

Rebecca Adlington
Double Olympic gold-medal winning swimmer on BBC TV

Daniel Wiffen looks in a perfect position here.

He is hardly even kicking so it seems like he is playing it perfectly. I hope anyway.

This is getting very interesting.

Bobby Finke is flying with 500m left to go.

He is 1.38 seconds clear of the world record time set by Sun Yang at London 2012!

Italy's Gregorio Paltrinieri is second with Daniel Wiffen third.

Karen Pickering
Swimming & diving expert on BBC Radio 5 Live

Daniel Wiffen is looking very comfortable at the minute. He is tracking Gregorio Paltrinieri in second, just level with his knees at the minute and is in the view of Bobby Finke.