The World Boxing Super Series is delighted to announce three more rising challengers. Undefeated youngsters Avni Yildirim (16-0, 10 KOs) and Rob Brant (22-0, 15 KOs) have been added to the super-middleweight competition, while Mike Perez (22-2-1, 14 KOs) completes the cruiserweight line-up. With just one more spot to be filled, the Muhammad Ali Trophy now features nine undefeated fighters, five world champions and three former world champions.

Confirmed Cruiserweights (8 of 8)
Oleksandr Usyk (12-0, 10 KOs), WBO World Champion
Yunier Dorticos (21-0, 20 KOs), WBA World Champion
Murat Gassiev (24-0, 17 KOs), IBF World Champion
Mairis Briedis (22-0, 18 KOs), WBC World Champion
Krzysztof Wlodarczyk (53-3-1, 37 KOs)
Marco Huck (40-4-1, 27 KOs)
Dmitry Kudryashov, (21-1, 21 KOs)
Mike Perez (22-2-1, 14 KOs)

Confirmed Super-Middleweights (7 of 8)
George Groves (26-3, 19 KOs), WBA Super Champion
Juergen Braehmer (48-3, 35 KOs)
Erik Skoglund (26-0, 12 KOs)
Jamie Cox (23-0, 13 KOs)
Callum Smith (22-0, 17 KOs)
Rob Brant (22-0, 15 KOs)
Avni Yildirim (16-0, 10 KOs)