Remember Farah had to haul himself off the track in Rio after a hearts in mouth-inducing fall. He mocks as he wins.
But Farah, not beaten over 10,000m since 2011, remained comfortable and made his move with a lap-and-a-half to go - and won in a sprint finish ahead of Cheptegei and Tanui.
"This stadium changed my life overnight".
The four-time Olympic champion won a thrilling fast-paced race at the London Stadium on Friday to clinch his first victory of his double bid as he prepares to quit the track this month. Turkey's national team will also participate with 27 athletes, the country's highest number of athletes in a world championships.
Special indeed - and with next Saturday's race to come, Farah looks set to do it all over again.
"What a way to end my career in London".
"It was when I almost tripped at the bell twice and I happened to catch my other knee. I do believe." He explained that he had needed stitches in his left leg after the race. "It helped a lot having that experience". 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. Geoffrey Kamworor was saying: "'It's my turn, I'm going to beat him, '" he said, with a laugh. They worked their hardest and they chucked everything at me.
And it will take something special from his opponents to deny him that 11th and final track crown before he switches to the marathon where even greater riches await.
And he immediately sought out his family in the sold-out crowd, after months away from home training, before taking his children on a lap of honour. However, he was tripped by Tanui twice and both times the British runner just managed to recover. I didn't expect to go off that hard, I couldn't hear myself breathe. I love London, I love the people.
As he got back to upright, there was no need to ask for a response from the stands as Farah stretched his legs down the back straight to a chorus of noise.
"I've got such a long stride I don't blame anyone", he said.
"It wasn't an easy race".
"But fair play to them". At the bell, Jemal Yimer had drifted back, Abadi Hadis had been running neck and neck with Mo Farah who finally let loose and exploded past him, Abadi, who finished fifteenth in the final a year ago at the Rio Olympics, ran out of stamina as Mo Farah, Kenyans Bedan Muchiri, Paul Tanui and Ugandan Joshua Cheptegei all ran past him.
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.
There was still a familiar resonance of the Olympics about the championships.
Sensing victory, the crowd of 60,000 went wild with two laps to go.
"Have I had a race that hard and ended up that banged up? No". I'm not really a fan of these blocks.
"I am hurt. I just had to be strong".
"It was unbelievable tonight".
In the biggest shock of opening night, Gen Suhr, the American Olympic gold medallist, failed to record a height in the pole vault.
No runner has ever achieved that - not Kenenisa Bekele (four, with Olympic and World Championship doubles in 2008-09), not Haile Gebrselassie (six at 10,000m, but no double wins), not Lasse Viren (four at Olympic level in pre-World Championships days), not Emil Zatopek, not Paavo Nurmi.