Great Britain's men's 4x100m relay team claimed the squad's fourth medal of the World Championships on day eight.
Christian Malcolm, Craig Pickering, Marlon Devonish and Mark Lewis-Francis clocked 37.90 seconds to finish behind the United States and Jamaica.
The British female quartet of Laura Turner, Montell Douglas, Emily Freeman and Joice Maduaka finished fourth.
Olympic champion Roman Sebrle claimed an elusive world gold after a brilliant fightback in the decathlon.
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1444: A podium finish for Great Britain then on day eight and that takes the tally above the target three medals to four, which seems like a perfectly fine way to round off the day.
Britain will have high hopes of another medal on Sunday in the women's 4x400m relay while Mo Farah cannot be discounted in the 5,000m.
Those of you staying up late on Saturday night - or with insomnia - can watch the women's marathon which begins at 2300BST and is live on BBC Two. Otherwise we have our last tango on the live, same time Sunday.
1431: So as predicted the American quartet of Darvis Patton, Wallace Spearmon, Tyson Gay and Leroy Dixon take gold in 37.78 seconds from Jamaica and Great Britain take third - just as they did in Helsinki two years ago.
Marlon Devonish told BBC Sport: "I'm very, very happy. It's gone smoothly, we worked hard and it's a nice way to end the championships."
"The British team needed to have good handovers to have a chance of any type of medal. It was a good performance from them to take advantage of those good hand-offs. Mark Lewis-Francis did what he was supposed to do as he didn't let anyone else - apart from Asafa Powell - come back and get him."
BBC pundit and five-time Olympic gold medallist Michael Johnson
1420: A safe changeover between Malcolm and Pickering and Devonish is going strongly on the third leg to put Mark Lewis-Francis right in the mix. Dixon and Powell come through but it looks like Great Britain have bronze. Here's Crammie: "What a run from Lewis-Francis on that last leg! He almost held off Asafa Powell."
1420: Here we go then. It's the big one. The men's 4x100m relay. What price an American cleansweep of the sprint relays - or can Asafa Powell snatch it on the anchor leg for Jamaica? Powell will not be up against double sprint champion Tyson Gay, as he runs on the bend in the third leg.
1415: So the American quartet of Lauryn Williams, Allyson Felix, Melissa Barber and Tori Edwards take 4x100m gold in 41.98 from Jamaica with the Belgium team sneaking the bronze. Britain finish in 42.87. Anchor Joice Maduaka tells BBC Sport:
"We have worked really hard this year and we are world class. We still have work to do on our speed and baton skills and we want to bring British women's sprinting up to the standard of the men's."
1406: Turner gets away strongly and the baton is through to Douglas safely on the second leg while the Americans run away with it with the Jamaicans at the front. Freeman puts Britain into third into the last changeover but that hand off to Maduaka is a little shaky. Britain lose ground and are overtaken by Belgium at the last and finish in fourth.
1403: It's ladies first as Laura Turner leads off Britain in lane two, before passing on to Montell Douglas, Emily Freeman and Joice Maduaka. Here's Colin Jackson: "I was impressed with how the team ran - it is a long time since a British team went under 43 seconds so easily. And it is a good team that they have got together now."
1353: Things will begin to get serious really soon as the sprint relays are just minutes away. Britain has teams in both the men's and women's events - but their medals chances are up in the air against some strong American and Jamaican teams.
1343: The medals are coming thick and fast now as American Brad Walker wraps up the pole vault title. Both he and Frenchman Romain Mesnil went over at 5.86m, but the American wins on count back. German Danny Ecker takes bronze with a best of 5.81m.
1345: Smith is really powering for the line but Sebrle is close behind and he holds his arms aloft as he crosses the line to win the elusive world gold. The Olympic champion - and the rest of the athletes - lie on the track but the Czech has a big smile on his face, as he knows that he has the title from Maurice Smith of Jamaica and Dmitriy Karpov.
1343: Leader Roman Sebrle is just tracking Maurice Smith, who lies in second place at the bell. But Smith is now forging ahead - a late bid for gold? He needs to beat Sebrle by three seconds.
1340: Just a little break there to eat some chips and chocolate cake - I believe it's called comfort eating to combat tiredness. So we're off with the 1500m - the final event of the decathlon which will decide how the medals are decided. A pedestrian start so far, Jonathan Edwards says: "I think the guy who won the walk earlier today was going quicker than this."
1322: Let's raise the flag. That was a slower heat and the Britons are through to Sunday' 4x400m final as fastest losers. The US won that heat with ease in 3:01.46 - but ready yourself for a super fast time when Jeremy Wariner returns for the final.
1320: The second 4x400m heat is under way in Osaka and it is likely to be the Americans all the way with Bershawn Jackson stretching out the field already. All the British quartet need to know is that their time is not bettered by the teams finishing in third, fourth or fifth.
1312: A quick check at how the pole vault is going along and it is American Brad Walker who leads after clearing 5.86m. Germany's Danny Ecker is second after clearing 5.81m with France's Romain Mesnil in third.
1311: Rooney finishes very strongly on the home straight and crosses the line in fourth with a time of 3:01.22 - so the British quartet will have to wait and see if they can go through as fastest losers. The arrow must hang in the air for now.
1309: Buck passes to Rooney in fifth but things do not go so well for France, who drop the baton.
1307: Steele works hard in the first leg and Steele hands it safely to Tobin. When the runners break at the stagger, Tobin is in sixth.
1305: The Brit arrow is hanging over Britain's 4x400m men in the heats, but which way will it go? So it's Andrew Steele to lead us off, followed by Rob Tobin, Richard Buck and Martyn Rooney.
1257: Some news from the decathlon. Roman Sebrle said he was going to fight and fight he has. That massive punt in the javelin of 71.18m has propelled him into the gold medal position with just the 1500m to go. Longtime leader Maurice Smith is 44 points behind with Dmitriy Karpov a further 18 points adrift.
1245: At the bell, Jo Pavey tries to come to the front but she just hasn't got the legs and Defar tries to stretch it home as the Briton goes backwards. Defar kicks away round the back straight but Cheruiyot is still with her. The Ethiopian world record holder hangs on though and adds the 5,000m world title to her Olympic crown, from Cheruiyot and Priscah Jepleting Cherono.
1244: Pavey tries to come around the outside but the field have got her covered as Defar takes to the front.
1241: Four laps to go in the 5,000m, and the pace is beginning to quicken now, with Kenyan Vivian Cheruiyot taking up the lead. Pavey is nestled in eighth behind the main contenders. Here's Crammie: "Still we wait for someone to attack, to try and win a medal here."
1236: OK, back in the 5,000m Britain's Jo Pavey is nestled towards the back of the pack and is a picture of concentration. Japan's Kayoko Fukushi leads through the first 1,000m with world record holder Meseret Defar on her shoulder. The defending champion Tirunesh Dibaba is not running here after suffering stomach cramps during her 10,000m victory.
1230: The women's 5,000m final is seconds away but there have been some interesting developments in the decathlon javelin. Leader Maurice Smith is not the most proficient javelin thrower - so his chances of clinging on to gold could hinge on this event. So far, he has managed a season's best of 53.61m - but Roman Sebrle launches a massive personal best of 71.18m to put himself thoroughly in the mix.
The yellow flag was for India, who have been disqualified (we don't have a suitable flag for that, sadly). BUT Britain's 4x400m ladies are through to Sunday's final after clocking a season's best 3:25.45. They looked pretty good and Ohuruogu will add strength for the final. Here's what anchor Nicola Sanders had to tell BBC Sport:
"My job was just to sit in there and I took it pretty easy. We have a really good chance - we're in with as good as shout as anyone."
1220: Sanders looks like she is just doing enough to make sure Britain's quartet qualify in second place. But there is a yellow flag on the track which means, uh-oh, a potential disqualification - let's hope Britain are clear of the danger.
1218: After running in lanes, Fraser bunches up with the field and is second behind the American runner Hennagan. As it stands it's Britain in two and the US leading as Okoro moves through the three leg.
1216: McConnell is way, way ahead in the first lap and off goes Fraser.
1215: So the British quartet of Lee McConnell, Donna Fraser, Marilyn Okoro and Nicola Sanders are ready to run their heat in that order. Top two and two fastest losers go through.
1205: Good news everyone, there will soon be a reason to get the British up or down arrows out as the women's 4x400m relay heats begin. The British quartet go in the second heat, so be patient, the arrow will be dusted off soon. The Russian quartet win the first heat in 3:23.49 - which is a world-leading time, by the way.
1200: "Come on Jo (Pavey) and Mo (Farah) and the relays, lets see if we can get at least one more medal."
Droitrob on 606
1157: Second-placed Dmitry Karpov improves his medal chances in the decathlon as he lands a season's best of 59.84m in the first pool of the javelin throwers.
1150: The men's pole vault is now ticking along in the field. Earlier, in the decathlon pole vault there was an array of head gear, including some sort of crash helmet and, er, a beanie hat. Will keep you posted on any unusual headgear from the specialist vaulters.
1145: Ohuruogu's sensational return to the track following a one-year ban for missing three out-of-competition drugs tests is still prompting debate on whether THAT ban tarnishes her gold medal somewhat. Here's BBC commentator Steve Cram:
"Some of the rubbish I've read and heard is very damaging not only to Christine, but to the sport as well. Christine has a huge mountain to overcome that shouldn't be there. Now she will probably be scared to come out and run again this season and I just wish people would look at the facts before they pronounce. She must have thought she was through the worst of it and to have reassess that must be very difficult for her."
You can post your thoughts on 606.
1135: Britain's women's 4x400m squad are out on the warm-up track doing some gentle jogging before their heat gets under way in round and about half an hour. 400m champion Christine Ohuruogu is out there with her team-mates but she is planning to sit out the heats to be fresh for the final.
1125: The men's 1500m wheelchair event is reduced to a 400m race as Australia's Kurt Fearnley launches an attack on leader Marcel Hug round the top bend. Fearnley takes gold in 3:26.30 and, there's some good news for the home crowd as Japan's Jun Hiromichi takes silver from Hug. Alldis crosses the line in seventh.
1120: Britain's world record holder David Weir isn't taking part in the men's wheelchair 1500m because of glandular fever, so Brian Alldis comes in for Team GB.
1116: The first group of decathletes are out in the penultimate discipline, the javelin. Dmitriy Karpov, who is lying in the silver medal position, is in this group along with fourth-placed Aleksey Drozdov. Leader Maurice Smith and live favourite favourite Roman Sebrle go in the later group.
1104: Canada's Chantal Petitclerc presses on at the bell and the world record holder takes it in three minutes 37.10 seconds in controlled fashion from Switzerland's Edith Hunkeler and American Jessica Galli. Woods got trapped on the inside on the final lap and comes in last.
1101: The first action out on the track is the women's 1500m wheelchair race where Shelley Woods represents Britain in the three-and-a-half lap event, and it looks like a tactical race as no-one is wanting to set the pace early on.
1100: The penultimate day of action in Japan signals relay time, which means just about anything could happen, and probably will.
The British quartet of Christian Malcolm, Craig Pickering, Marlon Devonish and Mark Lewis-Francis got the baton round safely in their heat to reach the final.
But four teams qualified with faster times so the Brits now need to add some pace to their safe hands.
Five-time Olympic gold medallist and the BBC's wise pundit Michael Johnson says the only tactic they have to employ is to focus on their own race and see where they finish. But will they?
There could be a better chance of a medal in the women's 4x100m as Laura Turner, Montell Douglas, Emily Freeman and Joice Maduaka went through as the third fastest qualifiers in 42.82.
The 4x400m heats for the men and women also get under way and again Britain will expect to be strongly placed.
The medal count for today is as follows: there are five to be settled in the evening session in the women's 5,000m, men's pole vault, decathlon and those pesky sprint relays.
Professional athlete Tyson Gay says: "I am extremely tired." We hear you Tyson but come on it's day eight, we're almost on the home straight now.