Deontay Wilder to face unbeaten Opetaia on Fury v Joshua undercard in Cardiff

• Wilder, 41, has won 43 of his 45 victories by knockout

• Australian cruiserweight champion moves up in weight

• Cardiff showdown will stream worldwide on Netflix

Deontay Wilder, the former World Boxing Council heavyweight champion, will face unbeaten Australian cruiserweight world champion Jai Opetaia on the undercard of Tyson Fury's showdown with Anthony Joshua in Cardiff on 11 December, organizers announced on Wednesday.

Opetaia will move up to heavyweight to take on one of history's most devastating punchers at the Principality Stadium with the event streaming live worldwide on Netflix.