By Steve Kim

Perhaps nobody has the perspective of Brian Viloria on this upcoming card at the StubHub Center this weekend that will be televised on HBO.

Viloria, who will be performing on the undercard is quite familiar with Roman "Chocolatito" Gonzalez (who faces WBC super flyweight champion Srisaket Sor Rungvisai) and Juan Francisco Estrada (who is matched with fellow Mexican, Carlos Cuadras, in a WBC final eliminator).

Viloria, who has won titles at both junior flyweight and flyweight, was defeated by both men.

He says the most difficult thing in facing Gonzalez is - ''the way he covers the distance so fast and just the amount of punches he throws at different angles and his precision is what makes him a  difficult fighter. It's not so much his power but just more of his accuracy and the way he imposes himself."

As for Estrada, Viloria states - "It's just the ranginess that makes it difficult. The way he moves in and out and gets out of the pocket and then gets back in. He does that really well and he loves to move around and he loves to use his range and his foot movements are great."

Viloria (37-5, 22 KO's) is paired with Miguel Cartagena on Saturday.

Back on March 18th Sor Rungvisai upset 'Chocolatito' in a highly disputed decision to take the WBC title. Afterwards the sanctioning body mandated a rematch between the two.

The match-up between Estrada and Cuadras is a WBC eliminator with the winner earning the right to face the winner of Saturday night's main event.

Steve Kim is the news editor for BoxingScene.com