Lucas Matthysse vs. Lamont Peterson
2013-05-18 : Lucas Martin Matthysse 140 lbs beat Lamont Peterson 141 lbs by TKO at 2:14 in round 3 of 12
- Location: Boardwalk Hall, Atlantic City, New Jersey, USA
- Referee: Steve Smoger
- Judge: Eugene Grant
- Judge: Barbara Perez
- Judge: Luis Rivera
Lucas Matthysse floored Lamont Peterson three times inside three rounds and forced a stoppage in the third to stake his claim as the top contender for current light welterweight champion Danny Garcia, who was ringside for the bout.
Peterson boxed effectively in the opening round and looked to keep Matthysse out of range. In the second round, however, the Argentinian had closed the distance and was able to land. A left hook to the forehead sent Peterson off balance and down in the final minute of the second round.
In the third round, a left hook sent Peterson down hard in the center of the ring. He stumbled and struggled to get to his feet, but was able to beat the count and was allowed to continue. Matthysse came forward and threw a combination and again Peterson stumbled backward and down. At that, veteran referee Steve Smoger waved an end to the bout.
It was the first knockout loss of Peterson's professional career and the sixth straight win for Matthysse, all coming by way of knockout.
- Lucas Matthysse 33-2 (31 KOs) vs. Lamont Peterson 31-1 (16 KOs)
- Matthysse entered as the #1 junior welterweight contender in the world according to The Ring Magazine. Peterson, a 1.8-to-1 betting underdog, was ranked as the #2 junior welterweight contender by the same publication.  
- The fight was fought at a 141-pound catch weight so neither man's title was at stake. At the time of the fight, Peterson held the IBF light welterweight title and Matthysse was the interim WBC light welterweight champion.
- The winner of this bout was expected to meet Danny Garcia in September for the WBC and WBA Super World Light Welterweight Titles. It was unofficial, however, at fight time as no contact had yet been signed. 
- Matthysse, who was expected to arrive in New York on May 14th, did not arrive until the 16th due to an alleged robbery in which his passport was "badly defaced and rendered unusable." Reports indicated it was someone inside of Matthysse's camp hoping to prevent the Argentinian from being able to make the fight. Matthysse and promoters were able to shorten the normally lengthy process of obtaining a new passport to a few days and he arrived to the U.S. two days before the fight. 
- Ticket prices for the event ranged from $25 to $250.
- Among those in attendance were Bernard Hopkins, Amir Khan, Danny Garcia, and Adrien Broner.
Purses: Matthysse - $700,000
- "I feel OK. I'm upset that I lost, but I feel good. He hit me with a good shot and I guess just finished the job. I felt as thought I could have fought through it, but the referee did the right thing." - Lamont Peterson in the post-fight interview
- Matthysse said in his post-fight interview that he wanted to fight current WBC and WBA light welterweight champion Danny Garcia and he felt that Golden Boy Promotions and Al Haymon could make the fight happen.
-  Recap of Lucas Matthysse vs. Lamont Peterson on Queensberry Rules Radio, featuring James Foley, Patrick Connor and David Greisman