Abner Mares moved up in weight and didn't miss a beat, stopping Daniel Ponce De Leon in the ninth round Saturday night to win a piece of the featherweight title.
Mares landed a right hand counter to drop Ponce De Leon, then swarmed all over him before referee Jay Nady moved in to stop the fight at 2:20 of the round. Mares, a former batamweight and super batamweight champion, remained unbeaten with the win.
The fight was on the undercard of the Floyd Mayweather-Robert Guerrero fight at the MGM Grand hotel.
Mares began controlling the fight in the second round, landing a left hook followed by a right that put Ponce De Leon up for the first time. Mares won most of the early rounds, but a low blow by Ponce De Leon in the seventh round seemed to give Ponce De Leon new energy.
The two fighters are stablemates, who fight under the same management but agreed to fight each other anyway.
''I wasn't just fighting some opponent,'' Mares said. ''He's my f...