The list is headlined by Usyk, the undefeated heavyweight champion, and undisputed super bantamweight king Naoya Inoue (33-0), who stays the one energetic undisputed champion among the many unbeaten titleholders.
Several other multi-title champions also remain unbeaten, including David Benavidez (32-0), who holds the WBA and WBO cruiserweight championships, and Zhanibek Alimkhanuly (17-0), the unified IBF and WBO middleweight champion.
The USA is heavily represented on the list with champions including Devin Haney (33-0), Dalton Smith (19-0), Richardson Hitchins (20-0), Shakur Stevenson (25-0), Gervonta Davis (30-0), Raymond Muratalla (24-0), Abdullah Mason (20-0), Bruce Carrington (17-0), Jesse “Bam” Rodriguez (24-0), and now Ennis.
Other undefeated titleholders include Rafael Espinoza (28-0), Seiya Tsutsumi (13-0-3), Jose Salas Reyes (17-0), Isleys Iglesias (15-0), and Collazo.
Former undisputed champion Terence Crawford also retired with an ideal 42-0 record, although he isn’t any longer an energetic champion.
Keeping an undefeated record becomes difficult as fighters reach championship level and start facing the division’s best contenders. Ennis joins a select group of unbeaten world champions spanning every level of the game, from heavyweight champion Oleksandr Usyk to minimumweight titleholder Oscar Collazo.