Professional career
Jefferson made his professional boxing debut on 19 June 1995 against Ismail Muhammad, knocking him out in the first round. [4] Within three years Jefferson had won 16 fights, winning all but two of them by knockout inside three rounds. [4] Jefferson, at 6'6" and generally weighing 240 pounds, quickly rose to prominence by combining explosive power with furious combinations. In 1998, he faced his first formidable opponent Marion Wilson. With 11–27–3 record, Wilson was known for his durability and toughness, having never lost inside the distance and occasionally pulling upsets, such as wins over Corey Sanders and Paea Wolfgramm or split draw against Ray Mercer. [5] [6] Jefferson won the fight by unanimous decision, with two judges scoring the bout 79–73 and one judge having a score 77–75. [4] [7]
Having been described as a brawler and a fan friendly attraction, Jefferson became a frequently featured fighter on HBO. [8] Jefferson then stepped up in competition, knocking out former world heavyweight title challenger Bert Cooper in the second round. [4] Within two months, Jefferson faced once-highly regarded prospect Obed Sullivan. [9] This was the first twelve-round fight in Jefferson's professional career. [4] He won the fight by split decision, with the scorecards being 117–112, 117–113 in favor of Jefferson and 115–114 in favor of Sullivan. [4] [10]
Six months later, Jefferson was scheduled to face Maurice Harris. Despite having 16–9–2 record, Harris was considered a formidable fighter, with Jim Lampley describing him as "the best 16–9 fighter out there". Harris' record included wins over then-undefeated David Izon and popular gatekeeper Jimmy Thunder and a split decision loss against faded Larry Holmes. [11] Coming into the bout, Harris was on a seven-fight winning streak, which included a wide UD win over Jeremy Williams. [11]
The fight took place at the Convention Hall in Atlantic City, in the undercard of the fight between Oleg Maskaev and Hasim Rahman. [12] The first round started with both fighters standing toe-to-toe and landing hard shots. In the second round, Jefferson dropped Harris twice. [8] A few seconds after the second knockdown, Harris turned the tide, dropping Jefferson with a right hand. [8] The round ended with fighters landing hard shots at each other. For the majority of the third round, Harris appeared to be more active, attacking Jefferson's body. At the end of the round, Jefferson landed an uppercut that knocked Harris' mouthpiece off. [8] [13] After relatively less action-packed fourth and fifth rounds, Jefferson dropped Harris again in the sixth with a series of body shots. [13] [8] Near the end of the round, Jefferson countered a left hand with the left hook of his own, knocking Harris unconscious. [13] [8]
The fight was widely praised for being a slugfest. [8] HBO commentator Larry Merchant called the second round "the best in heavyweight boxing since Bowe vs. Holyfield". [8] The KO was voted by The Ring as "Knockout of the Year". At the conclusion of 1999, Jefferson was ranked No.9 in heavyweight rankings by The Ring. [14]
This win lined up a shot against David Izon. Throughout the fight, Jefferson was soundly outboxing Izon, confidently winning rounds. By the seventh round, HBO commentators suggested the fight to be stopped due to Izon absorbing too much punishment. [15] In the eighth round, however, Jefferson appeared to have punched himself out. With 42 seconds left, Izon dropped Jefferson with a right hook. [16] It appeared as if Jefferson have fallen down mostly due to exhaustion rather than Izon's punch. [15] [16] Izon continued throwing unanswered shots on tired Jefferson, prompting the referee to stop the fight. [15] [16] At the time of the stoppade, Jefferson was unanimously winning on scorecards (78–72, 78–73 and 78–74). [17]
Four months later, Jefferson was scheduled to fight highly ranked contender Oleg Maskaev. In the first round, Maskaev dropped Jefferson with the right hand. During the fall, Jefferson broke his ankle and was limping for the rest of the fight, struggling to put weight on his left leg. [18] [19] [20] Jefferson was dropped again in the second. [18] He managed to hurt Maskaev with an overhand right in the third, but was unable to capitalize on it as he could not put weight behind most of his shots. [18] [20] Maskaev continued his assault on injured Jefferson, prompting the referee to stop the fight in the fourth round. [18]
After a quick knockout of an unknown journeyman Marcus Johnson, [21] Jefferson, with 4–2 record in the last six fights, was given a shot at the WBO world heavyweight title against Wladimir Klitschko. For the bout, Jefferson weighed in at 260.25 lbs, the heaviest in his professional career and 20 pounds heavier than in his previous bout. [4] The additional weight appeared to be muscle. [22] The fight lasted only two rounds. In the first round, Klitschko knocked Jefferson down with a short left hook. After the first round Jefferson's left eye was swollen. [22] [23] Jefferson was knocked down twice more in round two, once with a straight right hand and again with another left hook, with the fight being stopped after the last knockdown, declaring Klitschko the winner by TKO in the second round. Jefferson earned $400,000 for the fight. [23]
After defeating former WBC world heavyweight title challenger Phil Jackson (43–10 with 38 KOs coming into the bout) [24] and Sedreck Fields, Jefferson was allowed to participate in Thunderbox Heavyweight Tournament on November 30, 2002, promoted by Cedric Kushner. The tournament consisted of eight participants, which included two-time world heavyweight champion Tim Witherspoon, former and future world heavyweight title challengers Tony Thompson, Ray Austin and Jeremy Williams, experienced journeyman Maurice Harris, who had entered the tournament after knocking out future world champion Siarhei Liakhovich, [25] and undefeated, hard-hitting Gerald Nobles. [26] [27] [28] [29] [30] Each boxer, including Jefferson, was guaranteed $5,000 and the purse for the tournament winner was $100,000. All bouts took place at Trump Taj Mahal in Atlantic City, New Jersey and were scheduled for three rounds. The bouts were aired in the UK on Eurosport. [31] [25] In the first round, Jefferson defeated Ray Austin by second-round stoppage, but was beaten by Tony Thompson on points in semifinals. [25] [31]
Jefferson was scheduled to face Chris Byrd on April 17, 2004, at Madison Square Garden for the IBF world heavyweight championship, however he was forced to pull out of the fight due to a cut suffered in training. [32] Jefferson made one last world heavyweight title run, facing DaVarryl Williamson in an IBF eliminator. Williamson made quick work of Jefferson, winning by TKO in the 2nd, effectively ending Jefferson's career. [4]
DaVarryl Williamson 
New York City, U.S.
Lafayette, Indiana, U.S.
Philadelphia, Pennsylvania, U.S.
Las Vegas, Nevada, U.S.
Southfield, Michigan, U.S.
Wladimir Klitschko 
Munich, Bayern, Germany 
Oleg Maskaev 
Atlantic City, New Jersey, U.S.
David Izonritei 
Tunica, Mississippi, U.S.
Lake Charles, Louisiana, U.S.
Clement Hassan
Tui Toia
Parma, Ohio, U.S.
Council Bluffs, Iowa, U.S.
Kansas City, Missouri, U.S.
Waukegan, Illinois, U.S.
Inglewood, California, U.S.