Boxers: O

O'Neil Bell (26-4-1)
O'Shanique Foster (22-2-0)
O'Shaquie Foster (25-3-0)
Octavio Castro (10-4-0)
Octavio Narvaez (7-9-1)
Octavius Davis (2-2-1)
Odlanier Solis (20-2-0)
Ohara Davies (25-3-0)
Oisin Fagan (22-6-0)
Oksana Romanova (9-17-1)
Oktay Takalak (16-0-0)
Ola Afolabi (22-4-4)
Olanrewaju Durodola (25-4-0)
Oleg Maskaev (35-6-0)
Oleg Platov (28-1-0)
Oleg Yefimovych (27-2-0)
Olegs Fedotovs (10-6-0)
Oleh Platov (29-1-0)
Oleksandr Gvozdyk (20-1-0)
Oleksandr Usyk (25-0-0)
Oleksandr Yegorov (15-1-1)
Oliver Flores (27-2-2)
Oliver McCall (55-11-0)
Oliver Quintana (21-3-0)
Olivia Gerula (18-18-2)

Olivier Lontchi (18-1-2)
Oluwaseun Joshua Wahab (18-0-0)
Omar Adorno (16-10-1)
Omar Alejandro Aguilar (25-1-0)
Omar Andres Narvaez (48-2-2)
Omar Bell (8-1-0)
Omar Brown (1-1-0)
Omar Cande Trinidad (20-0-2)
Omar Chavez (36-4-1)
Omar Douglas (19-2-0)
Omar Estrella (15-3-2)
Omar Figueroa Jr. (28-2-1)
Omar Henry (7-0-0)
Omar Juarez (14-1-0)
Omar Lamiri (17-2-0)
Omar Nino Romero (31-4-2)
Omar Pena (4-0-0)
Omar Pittman (15-4-0)
Omar Rosales (11-0-0)
Omar Rosales (13-1-1)
Omar Salado (22-3-2)
Omar Sheika (32-11-0)
Omar Soto (23-11-2)
Omar Tienda (18-4-0)
Omri Lowther (14-1-0)

Onalvi Sierra (21-4-1)
Onoriode Ehwarieme (17-0-0)
Orial Kolaj (19-5-0)
Orlando Cruz (25-6-1)
Orlando Felix (8-0-0)
Orlando Fiordigiglio (31-3-0)
Orlando Gonzalez (11-1-1)
Orlando Lora (31-5-2)
Orlando Membreno (11-11-1)
Orlando Ramos (2-4-3)
Orlando Salido (44-13-4)
Osborne Machimana (18-6-1)
Oscar Ahlin (13-1-0)
Oscar Bravo (22-8-0)
Oscar Cantu (14-1-0)
Oscar Collazo (14-0-0)
Oscar Cortes (25-2-0)
Oscar Cortez (27-3-0)
Oscar Cuero (15-7-0)
Oscar De La Cruz (5-5-0)
Oscar De La Hoya (39-6-0)
Oscar Diaz (26-3-0)
Oscar Duarte (29-2-1)
Oscar Duarte Jurado (31-2-1)
Oscar Escandon (25-5-0)

Oscar Gallardo (8-3-0)
Oscar Gonzalez (20-2-0)
Oscar Ibarra (18-4-0)
Oscar Jesus Pereyra (24-1-0)
Oscar Larios (59-6-1)
Oscar Leon (27-6-0)
Oscar Marin (3-3-0)
Oscar Mendoza (4-2-0)
Oscar Meza (22-4-0)
Oscar Mojica (10-2-0)
Oscar Molina (13-1-0)
Oscar Negrete (19-2-1)
Oscar Riojas (10-7-1)
Oscar Rivas (28-1-0)
Oscar Roberto Medina (19-5-2)
Oscar Torres (8-0-0)
Oscar Valdez (32-3-0)
Oscar Vasquez (15-2-1)
Oscauris Frias (16-0-0)
Oshae Jones (8-0-0)
Osleys Iglesias (14-0-0)
Osnel Charles (9-4-1)
Ossie Duran (28-10-2)
Osumanu Adama (22-3-0)
Osumanu Akaba (32-11-1)