Tyson Fury is responsible for one of the most extraordinary and inspirational sporting comebacks of all time.
After his incredible victory over Wladimir Klitschko in 2015 - a win that saw him achieve his career ambition of becoming heavyweight champion of the world - Fury’s life began to spiral out of control.
The Manchester-born fighter suffered badly with depression and has made no secret of the fact that he considered taking his own life at his lowest point.
Fury faced battles with eating, drinking and substance abuse, and saw his weight balloon to 28 stone.
A return to the boxing ring seemed improbable, at best, several years ago - but Fury, who always speaks so honestly and bravely about his previous mental health struggles, was inspired to make his remarkable comeback by none other than Deontay Wilder.
Fury's video message to Wilder from 2017 goes viral
Following his trilogy fight victory against Wilder on October 9, which saw the 33-year-old retain his WBC and Ring Magazine titles at the T-Mobile Arena in Las Vegas, a video from 2017 of Fury has gone viral on Twitter.
The incredible footage shows Fury saying: “Guess who’s back? The one and only.
“Shout going out to the big ‘Bronze Bomber’ Deontay Wilder. Big respect, for giving me the motivation. Telling me I can’t do it and that I’m finished.
"I’m coming back for you baby. I’m coming back for you!"
Watch it here:
Is Tyson Fury's comeback the greatest in sports history?
Four years later and Fury has now defeated Wilder twice to cement his status as one of the greatest boxers of his era.
It’s an example to all of us about what’s achievable when you put your mind to something and truly believe in yourself.
A film will surely be made one day documenting Fury’s rise, fall and comeback. It’s one of the most remarkable stories in the history of sport.
Let’s check out some of the best reaction to Fury’s 2017 video:
Can you get full marks on our Tyson Fury quiz?