Roy Jones was regarded as the best pound-for-pound fighter on the planet until back-to-back defeats to Antonio Tarver and Glencoffe Johnson dented in his record.
His win-loss ratio of 49-3 is still brilliant, but the end may now be approaching for the 35-year-old, who trainer Alton Merkerson admits is "getting hit more than he used to."
Realistically, the end may now approaching for Jones, but that should not detract from this all-time great's many achievements.
He has been champion at middleweight, super middleweight, light heavyweight and - most recently - heavyweight.
After a glittering amateur career, Jones went to the Seoul Olympics in 1988, where he was widely expected to pick up the gold medal.
Inexplicably, the final was unfairly scored 3-2 in favour of local talent Si-Hun Park, although the judges named Jones the outstanding boxer of the Games
After turning professional, Jones fought like a man possessed, as if trying to make up for his experiences at the Olympics.
JONES JR. FACT FILE
Turned pro: 6/5/1989
Trainer: Alton Merkerson
Promoter: Don King
With dazzling hand speed and electric footwork, he brushed aside every fighter he came up against, including former world champion Jorge Vaca.
His first world title fight came in 1993 when he won the IBF middleweight crown by beating Bernard Hopkins, the last man to achieve that feat.
The following year he moved up to super middleweight as underdog to take on James "Lights Out" Toney, who was undefeated in 46 fights.
But it was Jones who triumphed convincingly on points at the MGM Grand in Las Vegas to capture a second world title.
There has never been any doubt about Jones' ruthless talent, but occasional question marks have surrounded the fighters he has not boxed.
At super middleweight he never fought British brawlers Chris Eubank and Nigel Benn or Ireland's Steve Collins.
And at light heavyweight Dariusz Michalczewski could argue he never got his shot.
10/04/1993: Beats Bernard Hopkins to win IBF middleweight title in Washington
17/11/1994: Beats James Toney to win Super Middleweight title in Las Vegas
22/11/1996: Moves up to Light Heavyweight and beats Mike McCallum to win WBC title
21/3/1997: Loses to Montell Griffin after controversial disqualification
7/8/1997: Knocks out Griffin in the first round to reclaim WBC Light Heavyweight title
18/7/1998: Beats Lou Del Valle to win WBA Light Heavyweight title
1999: Unifies WBC, WBA and IBF titles with win over Reggie Johnson
1/3/2003 Beats John Ruiz to win WBA Heavyweight title
In November 1996, Jones moved up to light heavyweight, beating Mike McCallum to win the WBC title.
The only blemish on Jones' record came as he lost that title in his first defence to Montell Griffin after a ninth round disqualification.
But a clearly outraged Jones avenged that loss with a first-round knockout in the rematch.
He beat Lou del Valle on points in 1998 to add the WBA light heavyweight title to his collection.
And in 1999 he unified the WBC, WBA, and IBF light heavyweight titles by beating Reggie Johnson in Mississippi.
A famous win over John Ruiz at heavyweight made Jones Jr the first middleweight champ to hold a piece of the heavyweight crown since "Ruby" Bob Fitzsimmons in 1897.
But then, Jones suffered his second and third losses to leave his brilliant career in the balance.