Four-time Olympic champion Mo Farah claimed World Championship 10,000m gold for a third successive time with a stunning display at London Stadium.
Farah, who won 5,000m and 10,000m Olympic gold in London in 2012, finished in 26 minutes 49.51 seconds to cap the opening day at the World Championships and declared the triumph his best.
But the relief of winning his 10th consecutive major gold medal - completing a hat-trick of world 10,000m titles - was better than any bandage or balm.
Farah, who will begin the defence of his 5,000m crown in heats on Wednesday, described his 10,000m win as "amazing".
Farah will focus on the marathon after ending his track career at the Diamond League meet in Birmingham and final in Zurich later this month.
The Kenyan threat has vastly more experience, with Geoffrey Kamworor, who beat Farah in the World Half-Marathon Championships past year, Rio silver medallist Paul Tanui and Bedan Karoki in the field. I'm losing in my home town.
Soon, Farah had the race under his control and he was in his usual forthright position at the front as the bell rang for the final lap.
Asked if he could achieve the double in his final championships as a track runner, Farah responded: "I've got a few scratches, I've got a few bruises but if I believe enough, and if I rest up enough, it's possible".
Farah, who was almost tripped up on the final lap of a hugely exciting race, proved too good once again for all-comers to further etch his name into track and field history.
He added: "Being smart has helped me to get to where I am. It's been a long journey, it's been incredible", said Farah who was accompanied by his family on a lap of honour. I was doing some of my key sessions with 10 or 12 days to go and the guys saw what I was doing.
Bolt ran a time of 10.08 seconds in his heat without really stepping out of second gear, while compatriot Yohan Blake and Christian Coleman of the United States also progressed from the preliminary round.
The Kenyans resumed their control up front soon afterwards and upped the pace recording a lap of 61 seconds with the Ugandans tucked in behind them and Farah 11th. "With two laps to go I didn't have the gas to go with them". "I have been running in the Pegasus for years, and it's a shoe I can always rely on", says Farah, who's been known to log an average of 125 training miles a week. It is just not what I am used to.
'Hard races have to be run.' None harder than the one that brought his most recent medal.
6 - only six athletes - Emil Zatopek, Vladimir Kuts, Lasse Viren, Miruts Yifter, Kenenise Bekele and Farah - have won the distance double in a single Olympics.
Reece Prescod qualified in 10.03 seconds, with CJ Ujah joining him in 10.07 seconds and James Dasaolu coming home second behind Usain Bolt in the sixth heat in 10.13 seconds.