Amir Khan vs. Lamont Peterson

Amir Khan vs Lamont Peterson, billed as Capital Showdown, was a boxing match for Khan's WBA (Super) & IBF light welterweight titles. The fight took place in the Convention Center in Washington, D.C., United States, on 10 December 2011. Khan was making the first defense of his IBF belt against his mandatory challenger.

Build-up
Golden Boy Promotions CEO Richard Schaefer announced in a conference in London to officially kick off "Capital Showdown: Khan vs. Peterson".

The tour touts an HBO-televised bout featuring WBA (Super) & IBF light welterweight champion Amir Khan of Bolton, England, in the first defense of his IBF belt against mandatory challenger Lamont Peterson of Washington, D.C., which was slated for December 10 in Peterson's home town.

Khan had won eight consecutive fights, four of them by knockout. Peterson won an IBF eliminator with a 12th-round stoppage of Victor Cayo (26-2, 18 KOs) in July, earning the organization's No. 1 contender status and the right to challenge Khan.

Fight
The fight was fought in front of a packed house at the Convention Center, with an announced audience of 8,647. After an extremely close, evenly matched fight for 12 rounds, the heavily pro-Peterson crowd was thrilled by the split decision announced in Peterson's favor. Khan scored a knockdown in the first round, but was penalized twice by referee Joe Cooper, once for excessive shoving with the forearm and later for hitting on the break. The points proved to be the difference between the two scorecards that favored Peterson.

Controversy
After the bout Khan, complained about the referee and made accusations of impropriety that the judges' scorecards had been "interfered with" by a man at ringside who celebrated with Peterson after the decision. This man was later identified as Mustafa Ameen, a figure affiliated with the IBF but who had no apparent reason to be involved. Khan's camp launched an appeal with the IBF in December, principally on the grounds of "miscalculation of the scoring," and "inappropriate conduct by officials" and in January 2012, after reviewing the evidence, the WBA ordered a rematch.

Despite rumors, on 3 March 2012, the WBA did not reinstate Khan as the WBA Super Light-welterweight Champion.

However, on 8 May 2012, it emerged that Peterson failed a drug test, testing positive for a banned substance thought to be synthetic testosterone, and the rematch has since been called off.

Televised

 * Super Lightweight Championship bout: 🏴󠁧󠁢󠁥󠁮󠁧󠁿 Amir Khan vs. 🇺🇸 Lamont Peterson
 * Peterson defeats Khan via split decision. (113-112, 113-112, 110-115)
 * Heavyweight bout: 🇺🇸 Seth Mitchell vs. 🇺🇿 Timur Ibragimov
 * Mitchell defeats Ibragimov by TKO at 2:48 of round 2.

Untelevised

 * Light Welterweight bout: 🇺🇸 Anthony Peterson vs. 🇳🇬 Daniel Attah
 * Peterson defeats Attah via unanimous decision.
 * Super Middleweight bout: 🇩🇴 Fernando Guerrero vs. 🇺🇸 Robert Kliewer
 * Guerrero defeats Kliewer by TKO at 0:45 of round 5.
 * Lightweight bout: Jamie Kavanagh vs. 🇩🇴 Ramesis Gil
 * Fight ends in a majority decision.
 * Welterweight bout: 🇺🇸 Dusty Harrison vs. 🇺🇸 Terrell Davis
 * Harrison defeats Davis by KO of round 1.
 * Light Heavyweight bout: 🇺🇸 Thomas Williams Jr. vs. Reynaldo Rodriguez
 * Lightweight bout: 🇺🇸 Terron Grant vs. 🇺🇸 Dashawn Autry
 * Grant defeats Autry by KO of round 1.
 * Lightweight bout: 🇺🇸 Joshua Davis vs. 🇺🇸 Christopher Russell
 * Davis defeats Russell via unanimous decision.
 * Davis defeats Russell via unanimous decision.