From the 70-meter mark, it was easy.
The Jamaican great revved up the crowd at the Olympic Stadium and then coasted to victory in his first-round heat in the 100-meter dash.
Bolt's true farewell was to come 24 hours later in the finals of the 100m, not the heats he had messily navigated on Friday's opening night, whereas Farah's race was a final farewell, at least in that event.
Mo Farah will bring down the curtain on his championship career with a bid for yet another distance double in London but, despite his unmatchable palmares, the Briton still finds himself fighting for appreciation in some quarters. He was in his element; if there is such a thing as a comfort zone, this is it for Farah, to the extent he at one stage gestured to the crowd to increase the cheering decibels while all the while running to his own beat.
But Mageean, who is an Olympic semi-finalist from Rio a year ago and a European bronze medalist, has the form this season to at least make the semi-finals here in London.
Karoki finished seventh while Kamworor wound up 11th on that occasion.
Those runners who tasted glory before the Farah flourish can be thankful for his disobedience.
The 34-year-old is aiming for the treble double, gold in the 5000m and 10000m at three successive World Championships. Kamathi had interrupted Ethiopia's dominance.
After he crossed the line, he swore that the noise in the stadium matched the incredible din of his 2012 tours de force when he won the 10,000m and 5,000m here.
2005 marathon world champion Paula Radcliffe: "It was the best of all of Mo's victories".
"It goes without saying that the battle will be bruising, but personally I have worked on my endurance, speed and last kick".
"It was unbelievable tonight, I had to get my head around it".
"The event is very strong with Sifan and Caster, so it will be a very fast race I think", Dibaba said, looking ahead to the potential final.
David Baynes-Robinson, put his name forward as a field of play volunteer after being inspired by the efforts of volunteers at the London 2012 Olympic Games. "We shouldn't allow that to happen because I believe we have got good endurance", said Tanui. Hadis' fellow Ethiopian, Jemal Yimer, is the second-fastest man over the distance this year and could also be in contention.
The Duke of York has officially opened the World Athletics Championships in London on behalf of The Queen. The pair will be joined by 18-year-old teammate Anduamlak Belihu to form a strong trio. After the sparse crowds of Beijing and Moscow it made for a welcome change.
Bolt was far from happy with his start - afterwards describing the starting blocks as the worst he has used - but recovered to win his heat in 10.07 secs.