Eumir Marcial made quick, easy work of Ricardo Villalba on Saturday night in San Antonio.

The Filipino southpaw, a middleweight who is promoted by Manny Pacquiao’s company, knocked Villalba to the canvas once apiece in the first and second rounds on his way to a technical-knockout victory at Alamodome. Showtime streamed Marcial’s win on its YouTube channel as part of the network’s coverage of the Rey Vargas-O’Shaquie Foster undercard.

Marcial (4-0, 2 KOs) dropped Villalba for the second time with a right hook to the top of his head. Villalba (20-8-1, 8 KOs, 1 NC) went down to his gloves and knees 36 seconds into the second round.

Argentina’s Villalba beat referee Mark Calo-oy’s count, but his legs weren’t steady. Calo-oy thus halted their scheduled eight-round bout 48 seconds into the second round.

Villalba has lost four fights in a row, including two by technical knockout. He has lost four times by TKO in his 13-year professional career.

Marcial first floored Villalba with 23 seconds left in the opening round. A left to Villalba’s body caused that knockdown.

Villalba waited for Calo-oy to count to eight before he got up from that punch.

In the bout before Marcial’s win, Dainier Pero battered Daniel Zavala for four rounds, but the Cuban heavyweight wasn’t able to stop his overmatched opponent in Pero’s third professional fight.

The 23-year-old Pero, a southpaw, shut out Zavala on each card and won by scores of 40-35, 40-36 and 40-36. Pero improved to 3-0 (2 KOs).

Zavala, of Del Rio, Texas, fell to 2-2-2.

Showtime streamed Pero’s win on its YouTube channel as part of the network’s coverage of the Rey Vargas-O’Shaquie Foster undercard from Alamodome.

Zavala never stopped trying, but Pero picked his shorter, sloppy opponent apart during the fourth round, right up until the final bell. The only thing left to determine during that final round was whether Pero would stop Zavala inside the distance.

After absorbing various power punches again in the third round, Zavala reached out to hold Pero with just over a minute to go in it. Pero freed his arms quickly and continued to tee off on his tough opponent for the remainder of the third round.

Pero pummeled Zavala throughout the second round, much the way he did during the opening three minutes.

The opening round amounted to target practice for Pero, who couldn’t miss with his left hook or right hand during those three minutes. Zavala kept coming forward, but he didn’t mount much offense against an opponent who didn’t seem the least bit concerned about what was thrown at him.

In the first fight Showtime streamed Saturday, David Whitmire’s pro debut didn’t last a round. The 17-year-old welterweight prospect from Washington, D.C. dropped Keith Foreman twice with left hooks in the opening round and produced a first-round technical knockout.

Whitmire’s sweeping left hook first made Foreman take a knee with 1:21 to go in the opening round. Another left hook, this time a shorter shot, knocked Foreman to his side with 53 seconds to go in the first round.

Calo-oy quickly moved in to stop the action as soon as Foreman went down for the second time. The official time of the stoppage was 2:10 of the first round.

Foreman, of Harlingen, Texas, slipped to 0-1 (1 NC).

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