1988: Prior to his fight with Lineal Champion, Carlos De Leon, Evander Holyfield declared that, assuming he won, he would then move up in weight to begin campaigning at Heavyweight. "I can dominate the cruiserweight division but what I really want is the heavyweight championship," Holyfield said. "And either way you go, you’ve got to go through Mike Tyson." (8)

In November 2014, he vacated his light flyweight title to challenge WBO junior bantamweight title-holder Omar Andrés Narváez (43–1–2, 23 KOs), Narváez was ranked No. 1 by The Ring and TBRB. The fight was scheduled for 30 December 2014. Narváez only loss had come by decision to Nonito Donaire at bantamweight in 2011. Narváez had won his first world championship in 2002, making twenty-seven title defenses of his belts since. Narváez had reigned as champion for 14 years, while Inoue arrived at the fight with a 7–0 record. However, the young challenger Inoue put Narváez down within a minute of the first round. He then proceeded to hurt Narváez over and over with carefully placed body shots. Inoue knocked out the long time champion in the second round to capture his second world title. Inoue become the first and only fighter to stop Narváez.

Yes, there are slight variations in weight class systems across different boxing organizations. While the major classes are generally consistent, organizations like the WBA, WBC, IBF, and WBO might have minor differences in weight limits for each class. However, the overall structure remains largely similar across these bodies.

Fury won the ABA super-heavyweight title in 2008 by defeating Damien Campbell 19:1. He turned professional later that year. Feeling disillusioned with amateur boxing, he decided not to wait for the 2012 Olympics. He finished with an amateur record of 31–4 (26 KOs).

Boxers must weigh no more than the upper limit of their division to qualify. This system ensures that matches are contested between fighters of comparable size and weight, maintaining the integrity and safety of the sport.

The exact date of the first middleweight champion is unknown, but some boxing historians believe that it was between George Fulljames and Jack Dempsey, though not the famous heavyweight Jack Dempsey of the 1920s.

The heavyweight division serves as the pinnacle of power boxing, an arena where colossal fighters duke it out for the ultimate glory. It’s a testament to the sport's diversity and adaptability, an exhibition of sheer force balanced with strategic prowess.

Going to the Olympic Team, he was one of the most highly regarded American Olympic boxers. Of all the U.S. 1988 Olympians, Angelo Dundee, a legendary trainer, chose Ray Mercer and Andrew Maynard, as the most likely to develop into world champions after they would have turned into professionals: "Mercer's 27, but that's not too old. The maturity is there. And the punch. Give him 10 fights as a pro and he'd be ready to start moving up," Dundee said on Mercer's potential as a pro. According to Kelvin Richardson of the '88 All-Army Team, Mercer was such a hard puncher, that even 16-ounce gloves weren't of much help for his sparring partners from being knocked off the ring, and his superheavyweight Olympic teammate, Riddick Bowe, didn't want to spar with Mercer for that reason.

Known as the greatest heavyweight boxer of all time, Muhammad Ali spent nine years and five months as the reigning champion. He set the record for being the only three-time lineal world heavyweight champion, winning the title in 1964, 1974, and 1979. Out of 61 fights, Ali has 56 wins.

Fighters may initially try to lose as much weight as possible - through the use of sauna suits and ramping up rigorous training - to then meet the maximum weight allowance of their division before they face their opponent.

In August 2021, a letter sent by the Association of Boxing Commissions (ABC) stating that the WBA having multiple titles is "misleading to the public and the boxers". The ABC also stated that if the WBA fails to do a satisfactory action regarding the issue, they would recommend to its members:

Several key milestones mark the evolution of boxing weight classes. For instance, the introduction of the Cruiserweight division in the late 20th century filled the gap between Light Heavyweight and Heavyweight, offering a more balanced competition for fighters who were too large for Light Heavyweight but not quite heavy enough for Heavyweight.

Pinweight: up to 101 lbs / 45.8 kg Light Flyweight: 106 lbs / 48.1 kg Flyweight: 110 lbs / 49.9 kg Light Bantamweight: 114 lbs / 51.7 kg Bantamweight: 119 lbs / 53.98 kg Featherweight: 125 lbs / 56.7 kg Lightweight: 132 lbs / 59.9 kg Light Welterweight: 138 lbs / 62.6 kg Welterweight: 145 lbs / 65.77 kg Light Middleweight: 154 lbs / 69.85 kg Middleweight: 165 lbs / 74.8 kg Light Heavyweight: 176 lbs / 79.8 kg Heavyweight: over 189 lbs / 85.7 kg

Fury met his wife Paris (née Mullroy) when she was 15 and he was 17. They began dating the year after they met, and married in 2008 at St. Peter in Chains Catholic Church in Doncaster, South Yorkshire. The couple have seven children together: four sons (all named Prince) and three daughters. When Fury was asked why all boxing division champions of his sons had the first name Prince, he said, "I'm a king and they're princes until they earn their rightful name." He named his first son Prince after Prince Naseem, his favourite British fighter. Paris suffered a miscarriage before Fury's cancelled bout with Ustinov in 2014, and lost another child on the day of his comeback fight against Seferi in 2018.