This afternoon in the semifinals round finale of the World Boxing Super Series (WBSS) tournament, undefeated challengers Callum "Mundo" Smith (23-0, 17 KOs), the World Boxing Council (WBC) Diamond champion, and late replacement Nieky "The Natural" Holzken (13-0, 10 KOs), square-off in the 12-round super middleweight bout, at Nurnberger Versicherung Arena in Nuremburg, Germany.

>>>>CLICK HERE FOR THE LIVE SCORECARD<<<<

Holzken, an undefeated Dutch prospect, replaced two-time world champion Juergen Braehmer, of Germany, who withdrew earlier this week from the WBSS semifinals match due to illness.

The Smith-Holzken winner will advance to the WBSS super middleweight championship final against World Boxing Association (WBA) and International Boxing Organization (IBO) Super Middleweight World Champion "Sir" George Groves (28-3, KOs), of the United Kingdom, June 2 at The O2 Arena in London, in a battle for the coveted Muhammad Ali Trophy.

The 27-year-old Smith, fighting out of the United Kingdom, won a 12-round unanimous decision over previously undefeated Erik Skoglund in the WBSS quarterfinals to capture the World Boxing Council (WBC) Diamond super middleweight title.

Holzken, 34, was preparing to fight Dmitri Chudinov in Saturday's WBSS Super Middleweight Substitute Fight.