April 7 After a fourteen-minute introduction, Naseem Hamed loses to Marco Antonio Barrera by unanimous decision. Barrera, then known as a brawler, surprisingly easily out-boxed Hamed, who later retired after his next bout.
April 22 Hasim Rahman defeats Lennox Lewis via 5th round KO in South Africa and loses the WBC and IBF heavyweight titles. Rahman lands a hard right hand for the upset knockout.
June 21 Lennox Lewis defends his title as he defeats Vitali Klitschko by technical knockout in 6 due to a cut in Klitschko's left eye. Klitschko was up on all of the scorecards at the time of the stoppage. There is talk of a rematch, but Lewis instead retires.
July 17 Jeff Lacy (as an up-and-coming super middleweight) defeats Richard Grant to win the vacant NABA Super Middleweight title as well as the USBA and WBC Continental Americas Super Middleweight titles.
April 10 Cory Spinks defends his undisputed welterweight title as he defeats Zab Judah by unanimous decision.
May 8 Manny Pacquiao and Juan Manuel Márquez fought for the Featherweight championship. Although he was knocked down 3 times in the 1st round, Márquez managed to control the succeeding rounds to earn a somewhat controversial draw. Márquez retained his WBA and IBF titles, while Pacquiao retained his Ring Magazine title.
May 7 Diego Corrales defeats José Luis Castillo by 10th round knockout for the WBO-WBC lightweight title unification. Both men were exchanging brutal punishment throughout the fight, before a dramatic tenth round in which Corrales scored a TKO after getting knocked down twice. It won Fight of the Year.
May 20 Marco Antonio Barrera defeats Rocky Juarez by split decision. Juarez was competitive throughout the fight, breaking Barrera's nose in the early rounds. The fight was originally announced as a draw, until it was later revealed that there were two scorecard tabulation errors.
February 3 Chad Dawson becomes WBC Light Heavyweight champion after defeating Tomasz Adamek by unanimous decision. Despite being knocked down from a straight right hand in round 10, Dawson dominates most of the fight with his speed.
March 3 Rafael Márquez moves up in weight class and defeatsRing Magazine and WBC Super Bantamweight champion Israel Vázquez by 7th round technical knockout. Vazquez did not answer the bell after badly breaking his nose and having trouble breathing.
March 17 Juan Manuel Márquez defeats Marco Antonio Barrera by unanimous decision to become the WBC Super Featherweight champion. In the seventh round there was controversy, as Marquez thoroughly dominated the round then got knocked down by Barrera. Referee Jay Nady ruled this a slip, then penalized Barrera for hitting while Marquez was on the canvas.
April 28 Juan Díaz unifies the WBA and WBO Lightweight titles after defeating Acelino Freitas. Freitas refused to answer the bell before round nine.
May 5 In a highly anticipated matchup, Floyd Mayweather, Jr.defeatsOscar De La Hoya by split decision, taking the WBC junior middleweight title. Despite being one of the richest fights in the history of the sport, the fight generally did not match the hype.
May 7 Former super featherweight and lightweight champion Diego Corrales dies in a motorcycle accident near his home in Las Vegas. Corrales died on the two-year anniversary of his thrilling first fight against José Luis Castillo, regarded as one of the greatest fights in modern history.
August 4 Israel Vázquez defeats Rafael Márquez by technical knockout in the 6th round of their rematch to recapture the WBC super bantamweight title. The two traded punches throughout the fight before Vázquez dominated Márquez in the sixth round, causing the referee to stop the fight.
August 25 Iván Calderón defeats Hugo Fidel Cazares in a split decision to win the WBO Light Flyweight title and to become The Ring Magazine Jr. Flyweight champion. This was Calderon's first fight at Light Flyweight.
September 29 Kelly Pavlik upsets Jermain Taylor by seventh round TKO to win the WBC, WBO and universally recognized middleweight championship. Pavlik was knocked down in the second round but rallied back against a tired Taylor.
November 4 Joe CalzaghedefeatsMikkel Kessler by unanimous decision in a unification bout for the WBA, WBC and WBO super middleweight titles. Calzaghe becomes the first undisputed super middleweight champion and surpasses the 20 defenses made by Bernard Hopkins and Larry Holmes at middleweight and heavyweight respectively.
November 11 David Haye beats Jean Marc Mormeck by a 7th round TKO to win the WBC cruiserweight title and the WBA super cruiserweight title.
March 22 Joel Casamayor defeats Michael Katsidis by 10th round technical knockout to defend the Ring Magazine Lightweight championship. In a thrilling back-and-forth fight, Casamayor knocked down Katsidis twice in the opening round, only to have Katsidis come back with a knockdown in the 6th. Casamayor knocked Katsidis down again in the 10th, hurting him in the process, and the referee called a halt to the contest.
April 12 Chad Dawson defeats Glen Johnson by a close unanimous decision and retains his WBC Light Heavyweight title.
June 28 Manny Pacquiao defeats David Díaz via 9th-round knockout to take the WBC lightweight crown, his fifth world title in five weight divisions.
July 26 Antonio Margarito knocks out Miguel Cotto in the 11th to gain the WBA Welterweight title. Cotto managed to control the early rounds, but Margarito came back with relentless pressure, eventually winning one of the greatest fights of the year. But the handwrap controversy surrounding Margarito was later to call the victory's validity into question.
October 18 Bernard Hopkins beats undefeated Kelly Pavlik via unanimous decision. Despite being 17 years older than Pavlik, Hopkins outworked and outhustled him throughout the fight.
November 8 Joe CalzaghedefeatsRoy Jones, Jr. in New York City by unanimous decision to retain the Ring Magazine Light Heavyweight title. Despite being put down in the 1st round, Calzaghe controlled the succeeding rounds to win the decision.
January 24 Shane Mosley defeats Antonio Margarito to win the WBA welterweight title by 9th round TKO. Controversy erupted before the fight when it was discovered that Margarito had an illegal plaster-like substance in his gloves. Margarito and his trainer had their boxing licenses revoked.
February 5: Joe Calzaghe retires unbeaten in 46 bouts as a two weight champion
February 28 Román González beats Francisco Rosas to get the WBA minimumweight title for the second time.
March 14 Amir Khan defeats Marco Antonio Barrera after the fight was stopped toward the end of the 5th round. Barrera suffering a severe cut, reopened from his previous fight, by a clash of heads late in the opening round. With Barrera deemed in no position to fight on by the ringside doctor, the fight went to the scorecards where Khan was ahead on all three.
March 21 Roy Jones, Jr. knocks out Omar Sheika in the 5th round to win the vacant NABO light heavyweight title. This was Jones' first knockout win in 6½ years. The undercard featured MMA fights.
April 25 Carl Froch beats Jermain Taylor via 12th round TKO. This was Froch's first defense of his WBC super middleweight title. Froch was knocked down in the 3rd round, and Taylor was knocked down in the 12th.
August 15 Roy Jones, Jr. stops Jeff Lacy in the 10th round. This was Jones' first defense of his NABO light heavyweight title. The fight was entitled "Hook City".
September 12 Iván Calderón defeats Rodel Mayol to defend his WBO light flyweight title for the fifth time. The two had previously fought to a draw.
September 19 Floyd Mayweather, Jr. dominates Juan Manuel Márquez in Mayweather's comeback fight, after retiring 21 months earlier. It was the first time Marquez had fought above the 135 lb (61 kg). limit. There was some controversy over Mayweather being two pounds over the 144 lb (65 kg) weight limit, for which he later paid Marquez $600,000. The fight was aired the same night that UFC 103 was aired, however sold much better, with 600,000 more PPV buys.
November 7 Chad Dawson defeats Glen Johnson in a rematch to win the WBC Light Heavyweight titled and retain the IBO Light Heavyweight title.
November 14 Manny PacquiaodefeatsMiguel Cotto by a technical knockout with 2:05 left in the fight to become the only boxer to win a world title in seven different weight divisions. As well as to win Cotto's WBO welterweight title and the inaugural WBC Diamond Belt.
November 14 Yuri Foreman defeats Daniel Santos by unanimous decision to win the WBA Super welterweight champion and become the first Israeli boxer to win a world title.