The American legend is set to make his UK fight debut on February 25 on the O2 Arena.
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It will be Mayweather’s sixth exhibition bout since officially retiring in 2017, after beating UFC star Conor McGregor, 34.
For Chalmers, 35, it will be only his second bout in the ring having switched codes from MMA last year.
With British fans braced to welcome Mayweather across the pond, here SunSport breaks down the bout.
Mayweather beat a who’s who in his 50-0 unbeaten career, beating the likes of Oscar De La Hoya, Canelo Alvarez and Manny Pacquiao.
And he closed his glittering career with one last money grab in a crossover extravaganza against McGregor.
But it proved not to be the last time fans who see Mayweather picking up quick and easy cash in the ring.
He returned in 2018 to knock out featherweight kickboxer Tenshin Nasukawa, 24, in round of their exhibition.
In the years to follow, he faced YouTuber Logan Paul, 27, ex-sparring partner Don Moore and MMA fighter Mikuru Asakura, 30.
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And his most recent cameo was in November, stopping social media sensation Deji, 25, brother to the famous KSI, 29.
Mayweather first announced that he would fight in London against Muay Thai veteran Liam Harrison, 37.
But Harrison was forced to deny he had signed just hours later and withdrew amid a series of injuries.
So Chalmers got the shock call to replace and within a couple of days, a deal was agreed.
The reality TV favourite shot to fame in MTV’s hit series Geordie Shore.
But in 2017, he turned to professional MMA and went on to amass a 5-2 record with five stoppages.
After seven bouts, Chalmers crossed over to boxing and in June made a successful debut over four rounds against Alexander Zeledon.
But he faces possibly the greatest test in boxing history by agreeing to fight Mayweather, even if the great turns 46 by the time of the bout.
In terms of record, obviously the two do not compare.
But physically, at 6ft, Chalmers has height and length over 5ft 8in Mayweather, who has a reach of 72 inches.
He also takes a slight weight advantage over Mayweather, who weighed 11st dead for his exhibition with Deji.
Chalmers was 11st 5lb for his boxing debut, although it is not clear what weight he can be next month.
In terms of power, the Newcastle supporter had two KOs in the cage, compared to Mayweather’s 27 in the ring.
It remains to be seen how the fight will play out, but Mayweather warned: “Different face, different name, same results.
“London we are still rocking and rolling on Feb. 25th at the O2 Arena. Tickets will be on sale soon. Stay tuned!!
“This will be my first time showcasing my talent live on Feb. 25th. I want the whole UK at the O2 Arena.”
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