A title unification clash between WBO champion Joseph Parker (24-0, 18 KOs) and IBF, IBO, WBA champion Anthony Joshua (20-0, 20 KOs) is now closer than ever to get finalized for a 2018 showdown.

Parker's promoter David Higgins of Duco has confirmed that they've received a contractual offer from Eddie Hearn, who handles Joshua, where the two sides have agreed upon the revenue split for a potential fight in the UK in March or April of 2018.

"We're really, really close," said Higgins. "We've agreed the ratio. The Joshua side gave a small concession, and we've agreed that the Parker side will get somewhere between 30 and 35 percent."

The two sides have been hammering out the details for the last few weeks.

They initially started at a 50-50 split - which was never going to happen.

Parker's side went down to a 60-40 split in Joshua's favor and then went down a step further to a 65-35 split - which still didn't sit well with Hearn and Joshua.

While other details such as venue and date are yet to to be finalized, Higgins stressed that the most critical aspect of the agreement was now in place.

"There's still a lot to agree, but we've agreed the most important thing which is the ratio. The rest should flow from there."

The three primary options for locations were either Manchester, London, or Cardiff, Higgins stated. The date is likely going to fall on March 31 or within the first two weeks of April.

It's understood the detailed document contains a number of clauses, including one for a rematch should Parker win the fight.

Parker was in action back in September, when he traveled to Manchester to win a twelve round decision over mandatory challenger Hughie Fury.

Joshua packed the house in October, when 78,000 fans came out to watch him secure a tenth round stoppage over Carlos Takam to satisfy an IBF mandatory obligation at Principality in Cardiff, Wales.