Heavyweight boxing championship records and statistics

1884–1910

Champions were recognized by public acclamation. A champion in that era was a fighter who had a notable win over another fighter and kept winning afterward. Retirements or disputed results could lead to a championship being split among several men for periods of time. With only minor exceptions, the heavyweight division remained free from dual title-holders until the 1960s. For an early example, see the 1896 World Heavyweight Championship.

Sanctioning organizations: 1910–present

Gradually, the role of recognizing champions in the division evolved into a more formal affair, with public acclamation being supplemented (or in some cases, contradicted) by recognition by one or more athletic commissions, sanctioning organizations, or a combination of them. The most notable examples with respect to the heavyweight division have included:

• The International Boxing Union (IBU), which was formed in Paris in 1910. The organization would become the European Boxing Union in 1946, but would recognize "world" champions in various divisions until it subordinated itself in that area to the World Boxing Council.
• The New York State Athletic Commission (NYSAC). A governmental entity initially formed for the purpose of regulating boxing in the State of New York, thanks to New York's place as the epicenter of boxing from the 1930s through 1950s, the NYSAC expanded its reach to sanctioning championship bouts. This practice continued until, like the IBU, the NYSAC became a member of the World Boxing Council (WBC).
• The National Boxing Association (NBA) was organized in 1921. In 1962, the organization was renamed the World Boxing Association (WBA).
• The World Boxing Council (WBC) was organized in 1963.
• The International Boxing Federation (IBF), which was founded in 1983 by the members of the United States Boxing Association after the USBA withdrew from membership in the WBA.
• The World Boxing Organization (WBO), which was founded in 1989 by disgruntled members of the World Boxing Council.

There are also titles that aren't considered major but play a significant role in legitimizing the heavyweight champion:

• Lineal championship was considered as the only form of the world championship until 1921. In professional boxing, the lineal champion is informally called "the man who beat the man", implying that the only way to win the championship is either to beat the current champion or (when the title is vacated due to suspension, retirement etc.) to become the winner of a fight between No. 1 and No. 2 (ocasionally No. 3) ranked contenders.
• The Ring began awarding championship belts in 1922, stopped giving belts to world champions in the 1990s, then reintroduced their title in 2002, and ignored the current ongoing world championship lineage. Under the original version of the policy, you could win the title by eather defeating the reigning champion or winning a box-off between the magazine's No. 1 and No. 2 (ocasionally No. 3) ranked contenders. A fighter could not be stripped of the title unless he lost or retired. Since May 2012, under the new policy, The Ring title can be awarded when the No. 1 and No. 2 contenders face each other or when either of them faces No. 3, No. 4 or No. 5 contender. In addition, the title can be taken away by losing the fight, not scheduling a fight for 18 months, not scheduling a fight with a top 5 contender for two years, or retiring.^[9]

Most opponents beaten in title bouts

As of October 13, 2018.

	Name	Opponents beaten
1.	Wladimir Klitschko	23
2.	Joe Louis	21
2.	Muhammad Ali	21
4.	Larry Holmes	20
5.	Lennox Lewis	15
5.	Vitali Klitschko	15
7.	Mike Tyson	11
8.	Tommy Burns	10
8.	Evander Holyfield	10
8.	Joe Frazier	10
11.	Ezzard Charles	8
12.	Jack Johnson	7
12.	Floyd Patterson	7
14.	Jack Dempsey	6
14.	James J. Jeffries	6

Most wins in title bouts

As of October 13, 2018.

	Name	Title bout wins
1.	Joe Louis	26
2.	Wladimir Klitschko	25
3.	Muhammad Ali	22
4.	Larry Holmes	20
5.	Lennox Lewis	15
5.	Vitali Klitschko	15
7.	Mike Tyson	12
8.	Tommy Burns	11
8.	Evander Holyfield	11
10.	Joe Frazier	10
11.	Ezzard Charles	9
12.	Floyd Patterson	8
12.	James J. Jeffries	8
14.	Jack Johnson	7
14.	Jack Dempsey	7
14.	Rocky Marciano	7

Most opponents beaten consecutively in title defenses

As of October 13, 2018.

	Name	Opponents beaten
1.	Joe Louis	20
2.	Larry Holmes	19
3.	Wladimir Klitschko	17
4.	Muhammad Ali	10
5.	Mike Tyson	9
5.	Tommy Burns	9
5.	Joe Frazier	9
8.	Jack Johnson	8
8.	Lennox Lewis	8
8.	Ezzard Charles	8
11.	James J. Jeffries	6
12.	Rocky Marciano	5
13.	Jack Dempsey	5
13.	John L. Sullivan	5

Most consecutive title defenses

As of October 13, 2018.

	Name	Title defenses
1.	Joe Louis	25
2.	Larry Holmes	19
3.	Wladimir Klitschko	18
4.	Tommy Burns	11
5.	Muhammad Ali	10
6.	Joe Frazier	9
6.	Mike Tyson	9
6.	Lennox Lewis	9
9.	Jack Johnson	8
9.	Ezzard Charles	8
11.	James J. Jeffries	7
12.	Rocky Marciano	6
13.	Jack Dempsey	5
13.	John L. Sullivan	5

Combined reigns

As of 24 September 2018. This list includes only major titles, and it does not include lineal championships after 1921.

	Name	Combined reign	Days as champion	Number of reigns	Title recognition
1.	Wladimir Klitschko	12 years, 0 months, 0 days	4 382	2	IBF, WBA, WBO
2.	Joe Louis	11 years, 8 months, 8 days	4 270	1	NYSAC, NBA
3.	Muhammad Ali	9 years, 5 months, 5 days	3 443	3	NYSAC, WBC, WBA
4.	Lennox Lewis	8 years, 5 months, 13 days	3 086	3	WBC, IBF, WBA
5.	Vitali Klitschko	7 years, 5 months, 28 days	2 735	3	WBO, WBC
6.	Larry Holmes	7 years, 3 months, 12 days	2 661	1	WBC, IBF
7.	Jack Dempsey	7 years, 2 months, 19 days	2 638	1	NYSAC, NBA
8.	John L. Sullivan	7 years, 0 months, 10 days	2 566	1	Universal
9.	Jack Johnson	6 years, 3 months, 11 days	2 292	1	Universal
10.	Evander Holyfield	6 years, 1 month, 1 day	2 223	4	WBA, WBC, IBF
11.	James J. Jeffries	5 years, 11 months, 4 days	2 156	1	Universal
12.	Joe Frazier	4 years, 10 months, 18 days	1 785	1	NYSAC, WBA, WBC
13.	Floyd Patterson	4 years, 10 months, 0 days	1 765	2	NYSAC, NBA
14.	James J. Corbett	4 years, 6 months, 10 days	1 652	1	Universal
15.	Jess Willard	4 years, 2 months, 29 days	1 551	1	Universal
16.	Chris Byrd	3 years, 10 months, 22 days	1 421	2	IBF, WBO
17.	Mike Tyson	3 years, 10 months, 16 days	1 415	2	WBA, WBC, IBF
18.	John Ruiz	3 years, 9 months, 21 days	1 390	2	WBA
19.	Deontay Wilder	3 years, 8 months, 7 days	1 346	1	WBC
20.	Rocky Marciano	3 years, 7 months, 5 days	1 312	1	NYSAC, NBA

Vitali Klitschko (right) retired as champion in 2005. Following his retirement, the WBC conferred "champion emeritus" status on Klitschko, and assured him he would become the mandatory challenger if and when he decided to return

Unofficial long title reigns

	Name	Combined reign	Days as champion	Number of reigns	Title recognition
N/A	Vitali Klitschko	10 years, 4 months, 29 days	3 802	2	WBO, Full WBC-to-WBC Emeritus-to-Full WBC (+The Ring vacated)
N/A	Muhammad Ali	10 years, 1 month, 16 days	3 689	3	The Ring/+lineal (+WBA, +WBC)

Individual reigns

Below is a list of longest reigning heavyweight champions in boxing measured by the individual's longest reign. The list includes both The Ring and lineal championships. Career total time as champion (for multiple time champions) does not apply.

	Name	Title Reign	Title Recognition
1.	Joe Louis	11 years, 8 months, 8 days	Universal
2.	Wladimir Klitschko	9 years, 7 months and 6 days	IBF (+WBA, WBO, The Ring)
3.	Larry Holmes	7 years, 3 months, 12 days	WBC-to-IBF (+The Ring/Lineal)
4.	Jack Dempsey	7 years, 2 months, 19 days	Universal
5.	John L. Sullivan	7 years, 0 months, 9 days	Universal
6.	Jack Johnson	6 years, 3 months, 10 days	Universal
7.	Muhammad Ali	5 years, 11 months, 9 days	The Ring/Lineal, (+WBA, WBC stripped)
8.	James J. Jeffries	5 years, 11 months, 4 days	Universal
9.	Vitali Klitschko	5 years, 2 months, 4 days	WBC
10.	Joe Frazier	4 years, 10 months, 18 days	NYSAC (+WBA, WBC)
11.	James J. Corbett	4 years, 6 months, 10 days	Universal
12.	Jess Willard	4 years, 2 months, 29 days	Universal
13.	Lennox Lewis	4 years, 2 months, 15 days	WBC (+IBF, WBA stripped, The Ring/Lineal)
14.	Rocky Marciano	3 years, 11 months, 29 days	Universal
15.	Deontay Wilder	3 years, 8 months, 5 days	WBC
16.	Chris Byrd	3 years, 4 months, 8 days	IBF
17.	Mike Tyson	3 years, 2 months, 20 days	WBC (+WBA, IBF, The Ring/Lineal)
18.	George Foreman	3 years, 0 months, 17 days	Lineal (+WBA, IBF stripped)
19.	Evander Holyfield	3 years, 0 months, 4 days	WBA (+IBF)
20.	Tommy Burns	2 years, 10 months, 3 days	Universal

Unofficial long reigns

	Name	Title reign	Title recognition
N/A	Vitali Klitschko	9 years, 7 months, 22 days	Full WBC-to-WBC Emeritus-to-Full WBC (+The Ring vacated)
N/A	Muhammad Ali	7 years, 0 months, 11 days	The Ring/+lineal (+WBA, +WBC)
N/A	James Toney	4 Years, 5 months, 14 days	IBA/IBU
N/A	Brian Nielsen	3 years, 7 months, 20 days	IBO

Before 1921

At the very beginnings, before the establishment of the sanctioning organizations, the title recognition passed through lineage in the fights under Marquess of Queensberry Rules. The champion was informally called "the man who beat the man". The fight between John L. Sullivan and Dominick McCaffrey is recognized by many boxing historians, including those at The Ring, to be for the inaugural World Heavyweight Championship under the Marquess of Queensberry Rules (however, some dispute that claim for various reasons, including the short distance of the bout, McCaffrey's small size and the fact that both fighters were Americans).^[11] The lineage was the only universally recognized form of a world championship until July 2, 1921, when Jack Dempsey became the inaugural NBA Heavyweight Champion.

Name	Title recognition	Title bout wins	Beaten opponents	Avg. of wins & BO
Tommy Burns	Universal	11	9	10
Jack Johnson	Universal	7	7	7
James J. Jeffries	Universal	8	6
Jack Dempsey	Universal	3	3	3
James J. Corbett	Universal	2	2	2
Jess Willard

Era of sanctioning bodies

The growing popularity of boxing led to a birth of various regional sanctioning organizations, with each recognizing their own champion. The major governing bodies were the National Boxing Association, formed in 1921, the New York State Athletic Commission, found after the Walker Law legalized prizefighting in New York in 1920, and the International Boxing Union, created in 1911 in Paris in attepmt create a unified international governing body for professional boxing. Both NBA and NYSAC made then-lineal champion Jack Dempsey their inaugural champion on July 2, 1921, and July 24, 1922, respectively.^[12]

Name	Title recognition	Title bout wins	Beaten opponents	Avg. of wins & BO
Joe Louis	NYSAC, NBA	26	21	23.5
Jack Dempsey	NYSAC, NBA	3	3	3
Primo Carnera	NYSAC, NBA, IBU
Gene Tunney	NYSAC, NBA		2	2.5
Max Schmeling	NYSAC, NBA, IBU	2	2	2
Sonny Liston	NYSAC		1	1.5
Jersey Joe Walcott	NYSAC, NBA
Jack Sharkey	NYSAC, NBA, IBU	1	1	1
Max Baer	NYSAC, NBA, IBU
James J. Braddock	NYSAC, NBA, IBU

Post-war era

The growing popularity of boxing outside of the USA led to creation of various boxing organizations, each strengthening their influence (most notably BBBofC) and having their own champion. This resulted in a growing number of boxers claiming to be legitimate champions. The disruption in boxing was solved after the World War II when the World Championship Committee (WCC) was created with NBA as its unanimous authority. The committee, however, was disbanded in 1955 when NBA, along with its new members (which included the Orient, Mexican and South American federations and boxing commissions of the Philippines and Thailand) left WCC citing lack of control over the organisation. The NBA's voting scheme guaranteed one vote for each state commission as well as one vote for each foreign country.^[13][14] On August 23, 1962, the NBA officially became the World Boxing Association and moved their headquarters to Panama City, Panama.

Name	Title recognition	Title bout wins	Beaten opponents	Avg. of wins & BO
Ezzard Charles	NBA, NYSAC	9	8	8.5
Floyd Patterson	NBA, NYSAC	8	7	7.5
Rocky Marciano	NBA, NYSAC	7	5	6

Worldwide expansion

A year later NYSAC along with European Boxing Union and BBBofC supported creation of the World Boxing Council. WBC was officially established on February 14, 1963, in Mexico City, Mexico by 11 countries (the United States, Puerto Rico, Argentina, United Kingdom, France, Mexico, Philippines, Panama, Chile, Peru, Venezuela and Brazil) that were invited by the President of Mexico Adolfo López Mateos to form an international organization to unify all commissions of the world to control the expansion of boxing.^[15] The reason for the move were concerns about WBA's alleged lack of desire to support professional boxing outside of the USA.^[16] In April 1983, members of United States Boxing Association along with Robert W. Lee (a former WBA vice-president) voted to expand the organisation and form the USBA-International. The organization later changed the name to International Boxing Federation.^[17] The inaugural IBF Heavyweight Champion was Larry Holmes, who relinquished the WBC title to accept IBF's recognition, thus helping the newly formed organization to establish its legitimacy. Another major sanctioning body, the World Boxing Organisation, was established in 1988 in San Juan, Puerto-Rico by a group of local businessmen. At the beginnings, when most of the challengers for WBA, WBC and IBF titles were Americans, WBO had a wider variety of countries, mainly European, represented in title bouts. In the inaugural bout, Italian boxer Francesco Damiani defeated Johnny du Plooy from South Africa by KO in the 3rd round. Before the Klitschko Era, United Kingdom tied USA for most wins in WBO Heavyweight title fights with 8.^[18] WBO struggled with receiving credibility at first, but by the beginning of the 2000s, the WBA was giving the same recognition to WBO champions as it did to WBC and IBF champions.

WBO, WBC, IBF and WBA are all recognized as major boxing organizations by each other and the International Boxing Hall of Fame. Riddick Bowe remains the only heavyweight boxer to win all four world titles (WBA, WBC and IBF in 1992–93 and WBO in 1995), while Vitali and Wladimir Klitschko are the only brothers to hold them at the same time (from 2011 to 2013). Wladimir is the only unified champion to successfully defend the title against one opponent twice (Tony Thompson in 2008 and 2012).

Keys:

     Active title reign

     Reign has ended

Note 1: WBA (Regular) champions are not included

Note 2: The list of most consecutive defenses includes all title reigns of each boxer

Note 3: The names in italics are champions that haven't won The Ring/lineal championship

Note 4: WBO heavyweight title bouts before June 1999 are not included^[10]

Title fight wins, beaten opponents and avg. Name Title recognition Title fight wins BO Avg. of wins & BO Wladimir Klitschko WBA, WBO, IBF 25 23 24 Muhammad Ali WBA, WBC 22 21 21.5 Larry Holmes WBC, IBF 20 20 20 Lennox Lewis WBA, WBC, IBF 15 15 15 Vitali Klitschko WBC, WBO Mike Tyson WBA, WBC, IBF 12 11 11.5 Evander Holyfield WBA, WBC, IBF 11 10 10.5 Deontay Wilder WBC 8 7 7.5 Anthony Joshua WBA, WBO, IBF 7 7 7 Nikolai Valuev WBA 6 5 5.5 George Foreman WBA, WBC, IBF 5 5 5 Chris Byrd WBO, IBF Joe Frazier WBA, WBC John Ruiz WBA 4 4 4 Michael Moorer WBA, IBF Lamon Brewster WBO

Consecutive title defenses, beaten opponents and avg. Name Order of title reign Title recognition Title defenses BO Avg. of defenses & BO Larry Holmes 1st WBC-to-IBF 19 19 19 Wladimir Klitschko 2nd WBA, WBO, IBF 18 17 17.5 Muhammad Ali 2nd WBA, WBC 10 10 10 Mike Tyson 1st WBA, WBC, IBF 9 9 9 Muhammad Ali 1st WBA, WBC Vitali Klitschko 3rd WBC Lennox Lewis 2nd WBA, WBC, IBF 8 8.5 Deontay Wilder 1st WBC 7 7 7 Anthony Joshua 1st WBA, WBO, IBF 6 6 6 Wladimir Klitschko 1st WBO 5 5 5 Evander Holyfield 2nd WBA, IBF 4 4 4 Joe Frazier 1st WBA, WBC Chris Byrd 2nd IBF Evander Holyfield 1st WBA, WBC, IBF 3 3 3 Nikolai Valuev 1st WBA John Ruiz 2nd WBA Lennox Lewis 1st WBC Lamon Brewster 1st WBO

Most wins in unified title fights Name Title recognition Title fight wins Wladimir Klitschko WBA, WBO, IBF 15 Muhammad Ali WBA, WBC 14 Mike Tyson WBA, WBC, IBF 9 Evander Holyfield WBA, WBC, IBF 7 Lennox Lewis WBA, WBC, IBF 6 Joe Frazier WBA, WBC 5 Anthony Joshua WBA, WBO, IBF 4 George Foreman WBA, WBC, IBF 4 Riddick Bowe WBA, WBC, IBF 2 Tyson Fury WBA, WBO, IBF 1 Buster Douglas WBA, WBC, IBF Michael Moorer WBA, IBF Sonny Liston WBA, WBC Leon Spinks WBA, WBC Hasim Rahman WBC, IBF

Most consecutive unified title defenses Name Order of title reign Title recognition Title defenses Wladimir Klitschko 1st WBA, WBO, IBF 13 Muhammad Ali 3rd WBA, WBC 10 Mike Tyson 1st WBA, WBC, IBF 8 Joe Frazier 1st WBA, WBC 4 Evander Holyfield 1st WBA, WBC, IBF 3 Lennox Lewis 1st WBA, WBC, IBF Anthony Joshua 1st WBA, WBO, IBF Evander Holyfield 3rd WBA, IBF 2 George Foreman 1st WBA, WBC Riddick Bowe 1st WBA, WBC, IBF 1 Lennox Lewis 2nd WBC, IBF Muhammad Ali 2nd WBA, WBC Sonny Liston 1st WBA, WBC

Title fight wins & beaten opponents

The list includes championship wins of heavyweight boxers from outside of the United States. It includes only major titles, without The Ring and lineal championships (after 1921).

Country	No. of champions	Boxers by Name	Avg. of wins & BO	Title wins	Beaten opponents
Ukraine	2	Vitali Klitschko, Wladimir Klitschko	38.5	40	37
United Kingdom	6	Bob Fitzsimmons, Lennox Lewis, Frank Bruno, David Haye, Tyson Fury, Anthony Joshua	27	28	26
Canada	3	Tommy Burns, Trevor Berbick, Bermane Stiverne	12	13	11
Russia	3	Nikolai Valuev, Oleg Maskaev, Sultan Ibragimov	8	9	7
Italy	1	Primo Carnera	3	3	3
Uzbekistan	1	Ruslan Chagaev	3	3	3
New Zealand	1	Joseph Parker	3	3	3
South Africa	2	Gerrie Coetzee, Corrie Sanders	2	2	2
Germany	1	Max Schmeling	2	2	2
Sweden	1	Ingemar Johansson	1	1	1
Belarus	1	Siarhei Liakhovich	1	1	1
Nigeria	1	Samuel Peter	1	1	1

Title streaks

The list includes longest championship streaks of heavyweight boxers by each non-US country. It includes only major titles, without The Ring and lineal championships (after 1921).

Country	Champion	Avg. of defenses & BO	Title defenses	Beaten opponents
Ukraine	Wladimir Klitschko	17.5	18	17
Canada	Tommy Burns	10	11	9
United Kingdom	Lennox Lewis	8.5	9	8
Russia	Nikolai Valuev	5.5	6	5
Italy	Primo Carnera	2	2	2
Uzbekistan	Ruslan Chagaev	2	2	2
New Zealand	Joseph Parker	2	2	2
Germany	Max Schmeling	1	1	1

Quickest stoppages in title fights

Note: WBO heavyweight title bouts before June 1999 are not included^[10]

Date	Fight	Method	Round	Time	Title
May 25, 2005	Lamon Brewster def. Andrew Golota	TKO	1	0:52	WBO
December 10, 1982	Michael Dokes def. Mike Weaver	TKO	1	1:03	WBA
March 17, 1908	Tommy Burns def. Jem Roche	KO	1	1:28	Lineal
June 27, 1988	Mike Tyson def. Michael Spinks	KO	1	1:31	WBA, WBC, IBF
July 21, 1989	Mike Tyson def. Carl Williams	TKO	1	1:33	WBA, WBC, IBF
October 4, 1997	Lennox Lewis def. Andrew Golota	KO	1	1:35	WBC
April 22, 1969	Joe Frazier def. Dave Zyglewicz	KO	1	1:36	NYSAC
September 1, 1973	George Foreman def. José Roman	KO	1	2:00	WBA, WBC
June 22, 1938	Joe Louis def. Max Schmeling	KO	1	2:04	NBA, NYSAC
September 25, 1962	Sonny Liston def. Floyd Patterson	KO	1	2:06	NYSAC, WBA
September 18, 1946	Joe Louis def. Tami Mauriello	KO	1	2:09	NBA, NYSAC
July 22, 1963	Sonny Liston def. Floyd Patterson	KO	1	2:10	WBA, WBC
May 25, 1965	Muhammad Ali def. Sonny Liston	KO	1	2:12	WBC
December 12, 1986	James Smith def. Tim Witherspoon	KO	1	2:12	WBA
February 6, 1993	Riddick Bowe def. Michael Dokes	TKO	1	2:19	WBA, IBF
April 17, 1939	Joe Louis def. Jack Roper	KO	1	2:20	NBA, NYSAC
May 15, 1953	Rocky Marciano def. Jersey Joe Walcott	KO	1	2:25	NBA, NYSAC
April 17, 1939	Joe Louis def. John Henry Lewis	KO	1	2:29	NBA, NYSAC
January 9, 1942	Joe Louis def. Buddy Baer	KO	1	2:56	NBA, NYSAC
November 4, 2017	Deontay Wilder def. Bermane Stiverne	KO	1	2:59	WBC
March 19, 2011	Vitali Klitschko def. Odlanier Solís	KO	1	2:59	WBC

Most title fight stoppages

Keys:

     Active title reign

     Reign has ended

Note 1: WBO heavyweight title bouts before June 1999 are not included^[10]

Note 2: The names in italics are champions that haven't won The Ring/lineal championship

	Name	Title fight finishes
1.	Joe Louis	23
2.	Wladimir Klitschko	19
3.	Muhammad Ali	15
4.	Larry Holmes	14
5.	Vitali Klitschko	12
6.	Lennox Lewis	11
7.	Mike Tyson	10
8.	Tommy Burns	9
9.	Joe Frazier	8
9.	Floyd Patterson	8
11.	Deontay Wilder	7
12.	Rocky Marciano	6
12.	James J. Jeffries	6
12.	Anthony Joshua
15.	Ezzard Charles	5
15.	Jack Dempsey

Oldest champions

As of October 13, 2018.

This is the list of the oldest heavyweight champions ordered by the age at their last day as champion.

	Name	Recognition	Last day as champion	Age
1	George Foreman	IBF	June 29, 1995	46 years, 170 days[19]
2	Vitali Klitschko	WBC	December 16, 2013	42 years, 150 days
3	Oleg Maskaev	WBC	March 8, 2008	39 years, 6 days
4	Jersey Joe Walcott	NBA, NYSAC	September 23, 1952	38 years, 236 days
5	Lennox Lewis	WBC	February 6, 2004	38 years, 157 days
6	Evander Holyfield	WBA	March 3, 2001	38 years, 135 days
7	Corrie Sanders	WBO	February 1, 2004	38 years, 25 days[20]
8	Larry Holmes	WBC	September 21, 1985	37 years, 322 days
9	Muhammad Ali	WBA	October 18, 1979	37 years, 274 days
10	Jess Willard	Universal	July 4, 1919	37 years, 187 days

Youngest champions

As of October 13, 2018.

	Name	Recognition	Date	Age
1	Mike Tyson	WBC	November 22, 1986	20 years, 145 days
2	Floyd Patterson	NBA, NYSAC	November 30, 1956	21 years, 331 days
3	Muhammad Ali	WBA, WBC	February 25, 1964	22 years, 39 days
4	Joe Louis	NBA, NYSAC	June 22, 1937	23 years, 40 days
5	John L. Sullivan	Universal	February 2, 1882	23 years, 110 days
6	Jack Dempsey	Universal	July 4, 1919	24 years, 10 days
7	George Foreman	WBA, WBC	February 22, 1973	24 years, 12 days
8	Joe Frazier	NYSAC	March 4, 1968	24 years, 52 days
9	James J. Jeffries	Universal	June 9, 1899	24 years, 55 days
10	Michael Dokes	WBA	December 10, 1982	24 years, 122 days