LOS ANGELES – Eduardo Ramirez figured out Miguel Marriaga relatively early in their fight Sunday night and easily out-worked the hard-hitting Colombian.

Ramirez extended his winning streak to four by recording a 10-round unanimous decision against Marriaga in the first pay-per-view fight on the Gervonta Davis-Isaac Cruz undercard at Staples Center. Judges Max De Luca, Damian Walton and Zachary Young all scored nine of the 10 rounds in this junior lightweight fight for Ramirez, 99-90.

Ramirez, a southpaw from Los Mochis, Mexico, improved to 26-2-3 (12 KOs). Marriaga, of Arjona, Colombia, slipped to 30-5 (26 KOs).

Ramirez remained the aggressor over the final three rounds, when he routinely backed up Marriaga and landed right hooks and straight lefts. His success in those rounds enabled him to build on his lead and cruise to a convincing victory.

A left-right combination by Ramirez moved Marriaga backward during the seventh round. Marriaga had difficulty landing clean shots on Ramirez in that round.

Ramirez began battering Marriaga just before the midway mark of the sixth round. He landed hard punches to Marriaga’s head and body, backed him into the ropes and made him cover up.

Ramirez landed a straight right hand just before the fifth round ended.

With just under a minute to go in the third round, Ramirez and Marriaga traded hard shots on the inside.

Toward the end of the third round, Marriaga’s right leg went out from under him and he fell to the canvas. Rosales still counted it as a knockdown for Ramirez, despite Marriaga’s protest.

Marriaga landed a hard right to Ramirez’s body just after the midway mark of the second round. Later in the second round, though, Ramirez landed a straight left that backed up Marriaga after either missing or grazing Marriage with a combination of rights and lefts.

Marriaga was the aggressor throughout the first round, when he tried to attack Ramirez’s body. Ramirez mostly moved away from him in what was largely an uneventful three minutes.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.