For years it has been touted as potentially one of British boxing's biggest fights but much to the frustration of fans it hasn't come to fruition as yet.
However, as their long careers appear on the verge of winding down, Amir Khan and Kell Brook are back trading insults and talking once more about agreeing to finally settle their differences inside the ropes.
In the latest broadside to their long-standing feud, Brook has labelled the Bolton-based Khan as a ' chinny clown' and refused to accept his demands to insert a rehydration clause into a fight contract between the pair.
Such stipulations are not uncommon in professional boxing and as Khan pointed out, is being used for Saul Alvarez's upcoming fight against Rocky Fielding in December.
Khan is insistent on the clause, which would prevent either fighter adding more than 10 pounds between the weigh-in and fight night. Brook, however, believes that with no title on the line, such a clause is unnecessary.
"Brook fought under IBF 10lb rule for few fights, I want the brook fight at 147lbs with a 10lb rehydration limit," Khan wrote on Twitter. "All the top fights do it. Give the fans the fight they want."
But Brook isn't having any of it and hit back with a brutal response.
He wrote: "Couple of things for you to Khansider you chinny clown: 1) There’s no IBF title on the line 2)Canelo is moving up a weight class. The fight fans know the only clause you’re really interested in is the get out clause!"
So it looks like we are still quite some distance away from the fight being finalised for next year then...
Khan and Brook have been among the biggest names on the welterweight scene for many years and have a long-held rivalry that has at times bordered on outright antipathy.
Khan has lived most of his adult life in the public eye since his stunning silver medal in the Olympics at the tender age of 17 and in the professional ranks has been a unified light welterweight champion.
His rival from Sheffield, Brook, was the IBF welterweight champ from 2014 to 2017 and didn't taste defeat until he stepped up to middleweight and faced the savage power of Gennady Golovkin.
He has, however, since returned to the welterweight ranks and with both men seeking lucrative paydays before they hang up their gloves, a fight between the two men has once again been mooted.
The negotiations may be tricky but there's no doubt it is the biggest fight currently on the table for both of them so it's in their best interests to find some sort of middle ground