He holds wins over Rock Allen in 2003, who beat him twice 2004 in the Olympic box-offs, Mike Alvarado and Andre Dirrell, as well as 2003 amateur world champion Willy Blain (in 2003).
Lamont Peterson made his professional debut on September 25, 2004, on the undercard of Glenn Johnson vs. Roy Jones Jr. at the FedEx Forum in Memphis, Tennessee.
On February 17, 2006, Peterson saw himself fighting for the Vacant WBC United States light welterweight title at the FedEx Forum against Jose Leo Moreno (12–1, 10 KOs).
Ramos was coming off a wide 12 round unanimous decision loss against top contender Demetrius Hopkins a month earlier.
In November 2007, Peterson fought his first fight outside of the United States, knocking out Ecuadorian boxer Humberto Toledo (31-4-2, 18 KOs) in round 1.
[4] In April 2009, Peterson defeated French boxer Willy Blain for the vacant WBO Interim title, making him mandatory to full titleholder and The Ring No.
After 12 rounds, the judges scored the fight 120-107, 119-108 and 118-110 in favour of Bradley, retaining his title and handing Peterson his first professional loss.
"[5][6] Following his first loss, Peterson returned to the ring on April 10, 2010, at the Hard Rock Hotel and Casino in Paradise, Nevada, against 32 year old boxer Damian Fuller at 143 pound catchweight.
[7] On October 12, 2010, it was reported by LA Times that Peterson would fight on the undercard of Amir Khan vs. Marcos Maidana, against The Ring No.
9 light welterweight Victor Ortiz (28-2-1, 22 KOs) on December 11 at the Mandalay Bay Resort & Casino in Las Vegas.
[10][11][12] In September 2011, it was announced that Amir Khan would defend his WBA and IBF light-welterweight titles in Washington, D.C., on 10 December against Peterson at the Convention Center.
Shaw told ESPN, although he won the bid, he still worked closely with Peterson's manager Barry Hunter to organise the fight.
On January 2, 2013, it was announced that Peterson would mark his first fight in 14 months defending his IBF title at the Armory in Washington, D.C., against Holt (28–5, 16 KOs) on February 22.
[20][21] Peterson overcame a sluggish start, floored Holt two times, and forced a stoppage in round 8 to successfully defend his IBF title in front of his home crowd.
Peterson sealed the win in the eighth when a barrage with Holt against the ropes caused referee Tony Weeks to step in and end it.
Holt opened the fourth round looking to step up the pace, but seemed to tire by the midway point and the champion took advantage.
[22][23] On March 23, 2013 Golden Boy Promotions announced that interim WBC light welterweight champion Lucas Matthysse (33–2, 31 KOs) would meet Peterson at Boardwalk Hall in Atlantic City on May 18, in the main event, live on Showtime.
Matthysse was waiting to fight full WBC titleholder Danny Garcia, who at the time, had a defence scheduled against Zab Judah.
[25][26] On November 19, 2013, Golden Boy announced a deal was in place for Peterson to make a defence in his home town against undefeated contender Dierry Jean (25–0, 17 KOs).
[28][29] In front of a hometown of 5,668, Peterson won the fight by unanimous decision, handing Jean his first career loss, with the judges scores of 118-111, 116-112 and 115-113.
Former world champion Paulie Malignaggi, who was working as an analyst for Showtime praised Peterson, stating he still has a huge claim at light welterweight.
Both fighters had something to prove as García was coming off an extremely tough fight with Mauricio Herrera and Peterson was still reeling from a knockout loss to Lucas Matthysse in 2013.
García maintained a steady attack in the last three rounds of the fight while Peterson began coming forward and throwing everything he had.
[37][38] On October 17, 2015, Peterson fought at the EagleBank Arena in Fairfax, Virginia, against undefeated welterweight prospect and 2008 Olympic gold medalist Félix Díaz (17–0, 8 KOs) in a scheduled 12 round fight.
"[39] In December 2016, early reports suggested there was a fight in the works, for David Avanesyan to defend the interim championship against Peterson.
[40] On January 11, 2017, a spokesperson for Avanesyan announced the fight would take place on February 18 at the Cintas Center in Cincinnati, Ohio, on the undercard of Adrien Broner vs. Adrian Granados on Showtime.
[45][46] On October 13, Boxing Scene reported that terms would be finalised in a week which would see Spence make his first defence on January 13, 2018, against Peterson.
[51] At a press conference in Los Angeles on November 13, 2018, PBC announced that Peterson would fight former super lightweight world champion Sergey Lipinets (14-1, 10 KOs) on FS1, as part of their deal with FOX.
The card was made official in February 2019, to take place at MGM National Harbor in Maryland on March 24, a Sunday special.
In the tenth round, Lipinets continued to hurt Peterson, caught him with a right hand, sending him back towards the ropes before dropping him.