Amir Khan has spent years of his career in hot pursuit of former five division world champion Floyd Mayweather.
Every time the contest appeared to be coming together, the negotiations would fall apart and Mayweather would go in another direction.
Back in August of 2017, Mayweather snapped a two-year retirement for a cross-sport boxing match with UFC superstar Conor McGregor. Before a packed crowed at the T-Mobile Arena in Las Vegas, Mayweather stopped McGregor in ten rounds.
After the win over McGregor, Mayweather once again retired from the sport.
But on December 31 in Tokyo, Mayweather will once again return to the ring in a three round exhibition against kickboxing sensation Tenshin Nasukawa.
Nasukawa, who is 5'4 and usually competes at featherweight, is a tremendous underdog despite Mayweather's advanced age of 42-years-old.
Khan believes the contest is "a joke" and says Mayweather is hurting the sport by taking part in these cross-sport contests.
"If you look at boxing and MMA - why is MMA and UFC surpassing boxing? Because they're putting the better fights on, they're putting the fights on that people want to see and these are just joke fights what Floyd Mayweather is doing," Khan said to Daily Mail.
"He's going to be getting a good cheque but it's hurting boxing isn't it? Boxing fans are going to buy the fight, think it's going to be a good fight, Mayweather is going to go in there and destroy the guy straight away (and) people will say it's a mismatch. The guy kicks well but you're not allowed to kick in this fight. If it was a kickboxing fight it would be different.
"When he fought McGregor, the same thing happened... Mayweather is very smart that way but I guess this young kid, he's going to destroy him again, people are going to look back and say it should never have happened. 'Those that bought the fight are going to hate on it and (think) 'why did we buy the fight?' - but they'd be stupid to buy the fight - and then they're all going to hate boxing and then when there is a good fight happening they're not going to buy it because they think boxing is a joke."
