Yelena Isinbayeva defended her pole vault crown as the only athlete to clear 4.80m - but she failed to break her world record of 5.01m.
There were also golds for Estonia's Gerd Kanter (men's discus) and Kenyan Janeth Jepkosgei (women's 800m).
World 100m champion Tyson Gay qualified as the fastest man for the 200m semi-finals in 20.08 seconds while Ireland's Paul Hession also advanced.
Briton Tasha Danvers-Smith ran bravely to reach the 400m hurdles final.
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1445: That's it for day four. Prepare yourselves for more excitement on Wednesday when the Brit count rises and thus provides a good reason to shout at your television, computer etc. There are real medals chances for Nicola Sanders and Christine Ohuruogu in the 400m final. Andy Baddeley goes in the 1500m final while Tom Parsons and Martyn Bernard go in the high jump. Be glued to your screens from 1130.
1435: Few more comments. Here comes MJ first:
"Clement has got incredible speed and could challenge the world record if he gets his stride pattern down. He needs to focus on this event as he does jump around during the season from 400m, hurdles and 200m."
1425: Russia wrap up the medals in the long jump. Lebedeva takes gold with a leap of 7.03m, Kolchanova takes silver with her final effort of 6.92m while Tatyana Kotova scoops bronze with her last jump too of 6.90m.
1429: American Kerron Clement reproduces his flat pace - he has a PB of 44.48 - to take the lead over the 400m hurdles. He stutters badly over the penultimate hurdle but it doesn't matter - he is untouchable as he wins in a world-leading 47.61. Olympic champion Felix Sanchez hangs on to silver - not bad for a comeback - while Poland's Marek Plawgo takes bronze.
1425: Here we go, the last track event of the day, the men's 400m hurdles final. It's a nervy start though as Felix Sanchez false starts.
1414: Isinbayeva fails in her third attempt to set a new world record of 5.02m. The Russian lets out a huge scream and then turns a somersault on the crash mat. But her campaign comes to an end with a second straight gold, and nothing more.
1404: "What a run by Tasha Danvers-Smith, definitely the best race she has ever run and there could hardly be a better time to do it!"
Isabre on 606
1401: Isinbayeva goes under the bar on her first attempt at a new world record of 5.02. Then she clatters off the bar at the second - one more to go then.
1340: That's it the medals are decided in the pole vault. Isinbayeva claims gold as the only athlete to clear 4.80m while Czech Badurova takes silver and Svetlana Feofanova takes bronze - both clearing 4.75m. BUT Isinbayeva will continue to vault, of course.
1346: Good news. It's an up arrow as Tasha Danvers Smith conjures a brave run to reach Thursday's 400m hurdles final. She came up the home straight in second behind Australia's Jana Rawlinson, but looked to be fading badly off the final hurdle. But the Briton survived a lurch to the line to go through in second, in a season's best 54.08.
Danvers-Smith takes time to tell BBC Sport before she nips off for an ice bath:
"I'm really pleased as my theme was not to go home. I wanted to make the final. I knew I had it in me, I knew inside that I had the ability to and I just had to get it right on the night. Even though it wasn't pretty I got the job done."
1340: Hurrah, soon there will be a chance to dust off a British arrow but which way will it go? Tasha Danvers-Smith goes in the 400m hurdles semi-final.
1335: Shall we peruse the standings in the long jump pit? Lebedeva still holds the lead with 7.03m ahead of Portugal's Naide Gomes (6.87) and Lyudmila Kolchanovla (6.84).
1335: The Russian world record holder goes clear at the second attempt to oohs and ahhs from the crowd. There are still five women left in the competition though.
1329: Oops in the pole vault, Isinbayeva misses her first attempt at 4.80m.
1323: Jepkosgei completes a dominant race by taking the gold in 1:55.05. The Kenyan bravely kept up the staggering pace from start to finish and the field couldn't live with her. Mutola was sitting pretty in second before she dramatically pulled out on the home straight, leaving Hasna Benhassi and Mayte Martinez to claim the medals.
"It was just utter exhaustion from Mutola trying to deal with the hot pace of Jepkosgei, but she is OK. The Kenyan women's gold medals are few and far between but that was one of the best we've seen from Jepkosgei."
BBC commentator Steve Cram
1321: Kenyan favourite Janeth Jepkosgei takes the lead and the first 200m in just over 26 seconds. Brendan Foster says: "That's too fast". She's first at the bell too.
1319: On the track the 800m is about to get under way - should be a good race. Three-time champion Maria Mutola, 34, pulls her head one way and then the other as she prepares for a tough race ahead.
1317: Isinbayeva is still under the towel, folks. Czech Katerina badurova leads the competition so far as she has cleared 4.75m.
1316: Russian Tatyana Lebedeva lands 7.03m to lead the long jump. She is sporting a very strange wispy reddish hair-do, a bit Kate Bush. Crammie says he has "no words to describe it".
1304: The Kenyans wrap up a one-two-three in the steeplechase. Brimin Kiprop Kipruto stretches away down the back straight and clips over the remaining hurdles to win from Olympic champion Kemboi and Richard Kipkemboi Mateelong in 8:13.02. They all hug across the line. And Crammie says: "They all have a big song and a dance and a party."
1302: Kemboi takes the lead at the bell but is quickly overhauled by Bouabdallah Tahri.
1301: There are three laps to go in the steeplechase and the pace has been pretty pedestrian so far. Sweden's Mustafa Mohamed is beginning to stretch the field a little bit though. The Olympic champion Ezekiel Kemboi is poised on his shoulder though.
1300: The ladies in the long jump are landing their first attempts. Heptathlete queen Carolina Kluft withdrew from the event in the end while Eunice Barber, who won silver in 2003, failed to qualify. Out on the track the men's 3,000m steeplechase is under way.
1252: Isinbayeva has passed at 4.70m and 4.75m in the pole vault - so she's back under the towel.
1248: Discus fans it's all over. Estonia's Gerd Kanter takes gold with 68.94m - his third throw. He really is excited by this, I can tell by the fist-pumping and yeahs. Another man struggling to contain himself is German silver medallist Robert Harting, who is just 22. Dutchman Rutger Smith takes third, while defending champion Virgilijus Alekna is down in fourth.
1245: Pole vault, then. Yelena Isinbayeva comes out from under her towel and clears 4.65m - her first attempt. There are still nine athletes left in the field though.
1242: There are a few things to catch up on. Let's go discus first and then pole vault. The discus is generally two kg or 4lb 7oz in weight and the man who has thrown that furthest in Japan so far is still Gerd Kanter, with his third punt of 68.94m. The final round is under way.
1240: Ireland's Paul Hession comes through strongly to win the final 200m quarter-final in 20.50. The semi-finals are on Wednesday. Hession is a member of Athenry Athletic Club and has put his medical studies on hold for the moment, and he tells the BBC:
"I put a bit more in; I was more up for it and it was good to win the heat and get through in a good lane for the semis. I have to believe I can make the final - it's going to be close but I have to stay positive and run my best race."
1222: Tyson Gay responds to Bolt by running another very calm and collected 200m and wins his quarter in 20.08, with Portugal's Francis Obikwelu, who was disqualified from the 100m, third. Gay, the 100m champion tells BBC Sport:
"Usain Bolt made me run a bit faster than I wanted to run, but I just wanted to get through as easy as possible."
And here's Crammie:
"That was a little bit of a statement from Tyson Gay. He was a bit tired this morning - but he is having to run all these rounds and doing all the hard work. There was a bit more show boating from Usain Bolt. And I think one thing we can be sure of is that the final will be quick"
BBC commentator Steve Cram
"Usain Bolt made me run a bit faster than I wanted to run, but I just wanted to get through as easy as possible.
1222: Jamaica's Usain Bolt looks very impressive as he claims the second 200m quarter from American Wallace Spearmon in 20.13. Bolt even had time to look every which way but straight ahead whilst running that. He tells BBC Sport:
"This morning I didn't get to run the corner that fast, I needed to be in the top two and took control of the race early and stuck it home. Wallace and I told each other we shouldn't go too fast, but ..."
1218: Hungary's Gabor Mate is down in fifth place in the discus and tries to gee himself up for another throw by singing "Help ... I need somebody." He wasn't bad, actually.
1208: The men's 200m quarter-finals are under way. In case you wondered, Britain did not select anyone for this event, specifically as the UK chiefs were not keen on Marlon Devonish - who has a season's best of 20.33 - doubling up. Youngster Alex Nelson has also looked good in the 200m but wasn't granted a place either. American Rodney Martin wins the first quarter in 20.25.
1208: How heavy is the men's discus? That's a little teaser to keep us ticking over. Back in the final, Estonia's Gerd Kanter leads after hurling 68.94m from Dutchman Rutger Smith and German Robert Harting.
1200: The live is recovering after Sue Barker referred to field commentator Paul Dickenson as "Dicko." BUT the women's pole vault is under way now too - though Yelena Isinbayeva is snubbing all the distances so far, as the bar is only up to 4.50m at the minute. In fact, she is lying on the floor with a towel over her face.
1154: The men's discus final is under way and Virgilijus Alekna is out there swinging away to try and snatch a third gold. Alekna is the tallest man in the field - over two metres tall and with an arm span of over two metres too. As it is, he is lying in seventh with a best of 63.68m.
1145: World number one and the defending champion Michelle Perry gracefully tops the standings in the second in 12.55. Ireland's Derval O'Rourke, who won silver at the Europeans last summer, struggles against a strong field and trails in last.
"I felt like I can do this and tomorrow it is time to put the burners on," Perry tells BBC Sport.
1135: And so here we go with the first live track action of the late session - the women's 100m hurdles semi-finals. Sweden's Susanna Kallur powers off to a good start and she wins the first semi on the dip in 12.64.
1125: It is admittedly a bit of a quiet day for the British athletes in Japan but the squad haven't been doing too badly at all. Steve Backley, who won two world silver medals in the javelin, is now a pundit on 5live and he says:
"The targets for the British squad are three medals and 14 finalists. A few weeks ago those figures were maybe optimistic but the British athletes are delivering right across the board. Nicola Sanders and Christine Ohuruogu set the world alight in the 400m, and we have chances across all the relays.
"We knew we weren't going to be tripping over medals but a lot of young athletes have had a positive experience here and that bodes well for the Beijing Olympics and beyond."
And that warrants a Brit up arrow, I think.
1115: What late risers have missed so far in Osaka is Britain's Tim Benjamin reaching the men's 400m semi-finals on Wednesday.
Droitrob on 606 says:
"I'll hold my hands up and apologise as I thought Tim Benjamin shouldn't have run the individual, but I was wrong, and he came through so well done Tim."
1110: There were rash predictions that Bank Holiday Monday's action might not be that exciting - but then look what happened, two British women into the 400m final, and dramatic men's 10,000m and women's 100m finals.
So there will be no predictions for Tuesday, where six gold medals will be handed out in Japan.
But IF predictions were to be made then the women's pole vault looks to be worth watching as defending champion Yelena Isinbayeva goes for another gold - and another world record.
The Russian's last world record of 5.01m was set at the Worlds in Helsinki in 2005.
The women's 800m and men's 400m hurdles finals look pretty tasty too. In the former Maria Mutola, at the age of 34, is chasing her fourth gold.
And in the hurdles, Olympic champion Felix Sanchez is back to his best after three fallow years.