David Rudisha did the seemingly impossible twice at the London Olympics on Thursday - smashing his own 800m world record and just about upstaging Usain Bolt.
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The powerhouse Kenyan utterly dominated the final, clocking one minute 40.91 seconds and stripping 0.10 off the standard he set two years ago.
As brilliant as Rudisha was to smash his own world mark without the aid of a pacemaker, it's inconceivable that Bolt could be kept out of the spotlight for long.
In winning the 200m final in 19.32 - the equal fourth-fastest time ever - the 25-year-old became the first man to successfully defend both Olympic sprint titles.
Jamaica swept the medals, with Yohan Blake again finishing second behind Bolt in 19.44 and Warren Weir claiming the bronze in 19.84.
Botswanan teenager Nijel Amos chased Rudisha home hard in the final straight of the 800m and was rewarded with a world junior record of 1:41.73 in an amazing race where seven of the eight finalists broke their personal bests, including bronze medallist Timothy Kitum from Kenya.
Even last-placed Briton Andrew Osagie's time of 1:43.77 would have been quick enough to have won the last three Olympic finals.
For the last two years, Rudisha has got his racing campaign off to a fast start on the Australian domestic circuit.
The 23-year-old's commanding victory on Thursday made him the fourth different Kenyan winner of the Olympic 800m title in the last seven Games.
"I've waited for this moment for a long time," said Rudisha, whose father won a silver medal in the 4x400m relay at the 1968 Games in Mexico City.
"To come here and break the world record is something unbelievable.
"I was well prepared this year and I had no doubt about winning.
"I was waiting for perfect conditions to break the world record because I knew this year I was in the shape to run 1:40."
Watching from the stands was Games organising chief Sebastian Coe, who had held the 800m world record for 16 years before being surpassed by Denmark's Wilson Kipketer and now by Rudisha.
Bolt had declared he needed to go back-to-back in the 100m and 200m to be considered a legend and he got the job done, becoming the first man since Finland's Lasse Viren to successfully defend two Olympic titles.
Viren won gold in the 5000m and 10,000m at the 1972 and 1976 Games.
"This is the one I wanted and I got it," said Bolt.
"I'm now a legend, I'm also the greatest athlete to live.
"I've got nothing left to prove. I've showed the world I'm the best."
While admiring, Rudisha didn't go quite that far, describing Bolt as the "greatest sprinter".
"Maybe one time if we can meet in 400 and compete it would be great. It'll be fun just to watch it," said Rudisha.
Aston Eaton and Christian Taylor continued what has been a very successful London track and field campaign for the United States, winning gold in the decathlon and men's triple jump.
Little more than a month after breaking the world record at the US Olympic trials, Eaton won gold with 8869 points - the eighth-biggest decathlon tally of alltime.
Countryman Trey Hardee took silver with 8523 and Leonel Suarez of Cuba pocketed the bronze with 8523.
Taylor was in danger of making an early exit from the triple jump final after fouling his first two attempts.
But the reigning world champ got on the board in round three and then produced the gold medal jump of 17.81m at his fourth attempt.
Will Claye claimed his second medal of the Games, adding triple jump silver (17.62m) to his bronze in the long jump.
Fabrizio Donato of Italy was third with 17.48m.
Barbora Spotakova from the Czech Republic threw 69.55m to successfully defend her Olympic javelin title ahead of German pair Christina Obergfoll and Linda Stahl.
Australia's Kathryn Mitchell was ninth with 59.46m.