You see, there were two races running that day over two different differences, and despite the fact that he finished first over one of the courses, he had - in reality - signed up for the other.
It has to be an absolute gut-wrencher for Omar Ahmed, who planned on running the Bristol 10k as part of the Great Bristol Run, but ended up running - and subsequently winning - the 22 kilometre half marathon.
His time of 63 minutes is no mean feat, either. However, he ended up empty-handed after he was disqualified.
Mr Ahmed veered off the wrong way when the two courses diverged over the differing distances, the BBC reports.
That said, where there is one unfortunate person, there is someone who gets an unexpected boost.
Under the revised positions for the men's race, Chris Thompson from Aldershot, Farnham and District Athletics Club, ended up being declared as the new race winner in a time of 67 minutes.
That's four minutes slower than Ahmed had run, but still a decent time.
The Great Run Company said that Ahmed entered the 10k race as an elite runner, and didn't officially enter the half marathon, and therefore 'unfortunately' would have to be disqualified.
They did say that he put in an 'impressive performance' but added that they'd received a number of objections from the other athletes that took part, and - after an investigation took place - they had no choice but to disqualify him.
Don't worry, though. He'll get his chance to win over the correct distance once again if he chooses, having been given entry to the Great Manchester Run next weekend as a consolation.
Paul Foster, the chief executive of the Great Run Company, said: "Rules are rules and in this case, they say we have to disqualify Omar.
"We salute his performance, and he has been invited to take part in next week's Great Manchester Run as an elite athlete.
"Of course, we also look forward to welcoming him back to Bristol for 2022's Great Bristol Run."
In many other years, this wouldn't have happened, as the 10k and half marathon are usually run separately on different days, but due to COVID-19, they were amalgamated into one event.
They raced through many recognisable locations in Bristol, including through the Avon Gorge and the harbour.
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