The Ultimate Encyclopedia of BOXING by Harry Mullan claims that the Longest unbeaten streak is Hal Bagwell.105-8 (183) 1938-48, Gloucester, UK. Boxrec shows his streak at 65-0-4. Packey Mc Farland (97) 1905-15, Chicago, IL, Boxrec shows a record of 107-1-5 and 70-0-5.

Pedro Carrasco (93), 1964-71, WBC Light champ of Huelva, Spain. A previous European champ. He won the title WDQ12 over Mando Ramos, 31-4, then lost back-to-back fights to Ramos.

Middleweight and welterweight champion ‘Sugar’ Ray Robinson (91), 1943-51. He was 89-0-2. Robinson won his first 40 fights before losing to Middle champ Jake ‘Bronx Bull’ LaMotta, 30-5-2. Five fights later, he defeated LaMotta for the title. He defeated LaMotta in 4 out of 5 fights.

Robinson was 129-1-2, when he lost to Randy Turpin, 40-2-1, in London, UK, July 1951. Two months later, in September at New York Polo Grounds, he defeated Turpin by stoppage in 10 rounds. Five fights after losing to Turpin he defeated Henry ‘Homicide Hank’ Armstrong, 132-17-8, who held the featherweight, welterweight and then lightweight titles all at the same time. Of course, Armstrong was a former champ past his prime and possibly the second-best P4P boxer after Robinson.

More in the modern era was WBO, IBF, and WBA Super Middleweight champion Joe Calzaghe from Wales, who came to the US at 44-0, defeating former champ Bernard Hopkins, 48-4-1, who would go on to win another world championship. Then he defeated former champion Roy Jones, Jr., 52-4, who was past his peak, and neither ever fought again. Calzaghe had difficulty with his hands, which caused his retirement. He became a unified champion, defeating Denmark’s WBA and WBC champion Mikkel Kessler, 39-0, in the previous fight before Hopkins.

Mexico’s Julio ‘J.C.’ Chavez, 107-6-2, was 89-0-1 when he lost for the first time to

Frankie ‘The Surgeon’ Randall, 48-2-1. He would defeat Randall in the rematch. He was 96-1-1 when he lost to Olympic Gold Medalist Oscar De La Hoya, 21-0.

Of course, two champions who retired unbeaten were heavyweight champion Rocky Marciano, 49-0, and multi-division champion Floyd ‘Money’ Mayweather, 50-0. Today, the unbeaten with the most wins is former two-time world division champion Terence ‘Bud’ Crawford, 40-0. Current Light heavyweight champion Gilberto ‘Zurdo’ Ramirez, who at 44-0 lost to Dimitrii Bivol, then 20-0.

There you have it for the most winning boxers. Now, let’s briefly take a look at the most losing boxers. Kristian Laight, of the UK, 12-279-9, with the most losses. Still active is Fonz Alexander, 9-167-1, of the UK, currently ranked eleventh with the most losses.

The worst record is Bheki ‘Black Tiger’ Moyo, 0-73-2, of Zimbabwe and the UK. He retired in 2015. Miguel Urdaneta, 0-37-1, is still active in Venezuela. Also active is Jake Pollard, 1-80, of the UK, Ganadij Krajevskij, 1-74, of Lithuania and the UK, and Jake Osgood, 1-61, of the UK.

There you have it, boxing fans, the winningest and the losingest boxers.

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