Las Vegas, NV -- (Sports Network) - Juan Manuel Marquez scored an 11th round technical knockout of Joel Casamayor to capture the Ring Magazine World Lightweight Championship Saturday night at the MGM Grand in Las Vegas.

The 35-year-old Marquez (49-4-1, 36 KOs), sent Casamayor (36-4-1, 22 KOs) to the canvas twice in the 11th round and referee Tony Weeks stepped in to stop the fight at the 2:55 mark of the round. It was a successful jump to the lightweight division for Marquez, who lost the WBC super Featherweight title in March to Manny Pacquiao in a split decision.

In the undercard, Vernon Forrest (41-3, 29 KOs) regained the WBC light middleweight belt from the previously unbeaten Sergio Mora (21-1-1, 5 KOs) by unanimous decision. Forrest lost the belt to Mora earlier this year.