A match-up between top-10 heavyweights Daniel Cormier and Roy Nelson is official for the co-main event of UFC 166.

The Houston Chronicle first reported the booking, which was subsequently confirmed by UFC officials on Monday.

The announcement comes just days after Cormier (12-0) lobbied hard for the bout on Twitter, drawing up a fake contract and imploring Nelson (19-8) to re-sign with the UFC. Nelson ultimately elected to do so, first signing the fake contract then repeating the process with Zuffa officials.

Due to Cormier's reluctance to fight AKA training partner Cain Velasquez, the bout may potentially serve as his last at heavyweight, a division where the undefeated former Olympian has racked up an impressive hit-list consisting of Antonio "Bigfoot" Silva, Josh Barnett and Frank Mir, among others.

Nelson, meanwhile, looks to rebound after a short-notice gamble against Stipe Miocic backfired, leading to a lopsided unanimous decision loss at UFC 161.

UFC 166 takes place October 19, 2013 at the Toyota Center in Houston, Texas. UFC heavyweight champion Cain Velasquez battles No. 1 contender Junior dos Santos in the night's main event.

UFC 166 fight card: