Lucas Matthysse vs. Humberto Soto
2012-06-23 : Humberto Soto 139½ lbs lost to Lucas Martin Matthysse 138¾ lbs by RTD at 3:00 in round 5 of 10
- Location: Staples Center, Los Angeles, California, USA
- Referee: Raul Caiz Sr
- Judge: Barry Druxman 48-46
- Judge: James Jen Kin 47-47
- Judge: Alejandro Rochin 49-45
- WBC Continental Americas Light Welterweight Title (vacant)
- Promoter: Golden Boy Promotions (Richard Schaefer)
- Ring Announcer: Jimmy Lennon Jr.
- Aired On: Showtime Championship Boxing
- WBC Light Welterweight title eliminator
- Lucas Matthysse 30-2 (28 KOs) vs. Humberto Soto 58-7-2 (34 KOs)
- Fight was the co-feature with Victor Ortiz vs. Josesito Lopez.
- Matthysse entered as the #5 junior welterweight in the world according to The Ring Magazine. Soto, a 2/1 betting underdog, was unranked by the same publication.  
- Matthysse entered with a record of 3-2 in his previous five bouts with both losses - Zab Judah (39-6) and Devon Alexander (21-1) - coming by way of split decision. Soto entered having not lost, albeit against lesser competition, in nearly four years.
- It was the first time Soto had been knocked down in his professional career and his second knockout loss.
Matthysse was twice warned in the opening round for pushing down on the back of Soto's head. Soto worked well from a distance with the jab and straight right hands. He closed the round with sound combination punching. Soto started Round 2 well with a higher work rate, before Matthysse came on in the final minute landing a pair of right hands. A right hand at the bell, sent an off-balance Soto down from what was correctly ruled a trip. Matthysse connected with some crisp right hands in Round 3. Soto retaliated with quick combination punching highlighted by left hooks. The two continued to trade in a back-and-forth Round 4. Matthysse continued to land the heavier shots in Round 5 both upstairs and to the body. A three-punch combination sent Soto stumbling back into the ropes. A followup right hand sent Soto down for the first time in his career in the final seconds of the round. Soto made it to his feet at the count of seven and held the top rope to keep his balance. He was allowed to continue and immediately went to his corner with the round having ended. The fight was stopped at the request of Soto's corner as he was badly dazed and would not respond to his corner.