Erik Morales vs. Marco Antonio Barrera III, billed as Once and For All, was a professional boxing match between the then 2-division world champion Marco Antonio Barrera and reigning WBC super featherweight world champion Erik Morales.

Morales, from his part, was undefeated and he had won the WBC super bantamweight title, knocking out Daniel Zaragoza in eleven rounds in 1997.

The first bout took place on February 19, 2000, at the Mandalay Bay Resort and Casino, in Las Vegas and was televised on HBO Boxing.

Morales was declared winner by split decision, with scores of 115-112, 114-113 and 113-114 and captured the WBO Super Bantamweight title.

Barrera was nonetheless declared the winner by unanimous decision, with scores of 116-112 and 115-113 and captured the WBC Featherweight title.

The early exchanges suggested Barrera was coping just fine beating Morales to the punch, firing more accurate shot and mixing his attacks to the body and head.

Rounds 7 and 8 saw a change with Morales finally connecting with his chopping right hand and for the first time Barrera felt that extra 11 lb of power.