Wilder and Joshua were unable to agree terms for an undisputed showdown when they held all four major world heavyweight titles between them.
Francis Ngannou will have Mike Tyson in his corner when he goes head to head with Fury in Saudi Arabia this weekend.
Wood absorbed punishing blows before finishing with a right to the temple and then a left when Warrington was on the way down in the seventh round.
The Australian retained his IBF cruiserweight title at Wembley Arena.
A date for the contest has not yet been set.
Billam-Smith claimed the WBO cruiserweight title after beating the previously undefeated Okolie in May.
Fury has faced plenty of scrutiny since his fight with the former UFC world heavyweight champion was announced.
Smith, who beat Eubank in a fourth-round stoppage at the same venue in January, was twice knocked down before the referee stepped in the 10th round.
The British fighters meet for a second time at Manchester’s AO Arena on Saturday, seven months on from Smith’s fourth-round stoppage victory.
Undisputed super-middleweight world champion Marshall signed a multi-year deal with MMA promotion Professional Fighters League, joining rival Shields.
The Ukrainian heavyweight could finally face Tyson Fury.
Promoter Frank Warren said the contest was spoiled by the referee’s decision to allow Usyk to recover after he was buckled by a low blow in the fifth.
There was controversy in the fifth round as Usyk was downed by a punch judged to be a low blow but might have been on the belt line.
Daniel Dubois is a long shot with the bookmakers to cause an upset against world heavyweight champion Oleksandr Usyk.
Dubois takes on WBA, IBF and WBO champion Oleksandr Usyk in Wroclaw, Poland, on Saturday.
