HOLLYWOOD, Florida – Atif Oberlton went the distance for the first time as a pro Saturday night, but he easily remained unbeaten.

The 6-foot-3 southpaw used his height and reach to mostly pick apart Robert Burwell throughout their six-round light heavyweight fight at Seminole Hard Rock Hotel & Casino. Philadelphia’s Oberlton (6-0, 5 KOs) shut out Burwell on two scorecards (60-54, 60-54) and won five of six rounds on the other card (59-55).

Burwell (9-7, 3 KOs), of Orlando, Florida, has lost five of his past six fights.

Earlier Saturday night, Polish middleweight prospect Fiodor Czerkaszyn stopped Gilbert Venegas Jr. in the fourth round of a fight scheduled for eight rounds.

Warsaw’s Czerkaszyn (20-0, 13 KOs) hurt Venegas with a right uppercut in the final minute of the fourth round. He followed up with a right hand, which led Venegas’ trainer to step up on the ring apron and request that their bout be stopped.

The official time of the stoppage was 2:29 of the fourth round.

Venegas (11-2, 7 KOs), of Des Moines, Iowa, lost by knockout for the first time in 13 professional fights.

In the previous fight Saturday night, Cuban southpaw Lenier Pero knocked out Joel Caudle in the first round of a scheduled eight-rounder.

A right hook by Pero sent Caudle crashing to the canvas, face first. Their fight was immediately stopped 2:29 into it.

Miami’s Pero improved to 8-0 and recorded his fifth knockout. Caudle (9-7-2, 6 KOs), of Fuquay-Varina, North Carolina, has lost six of his past seven bouts, including three knockout defeats.

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