
The Argentinian’s power eventually got to Barker after the 29-year-old had started the fight so well at the Boardwalk Hotel.
Both fighters used the early rounds to land jabs and Barker drew blood from Martinez’s nose in the fourth round with a good combination.
Barker got the blood flowing again in the next round when he landed a right but the champion put together a good combination in the sixth.
Martinez also finished the seventh strongly but Barker came back in the eighth.
Round nine saw Martinez again finish well and he shook Barker with two rights in the 10th which forced the Barnet fighter to rely on solid defence.
But as Barker looked to make up lost ground in the 11th he was rocked by a right which Martinez followed with another to the head which ended the contest.
Barker went to the canvas and although he tried to get back up he was counted out.
Martinez paid tribute to his opponent, saying on Sky Sports: “I wasn’t frustrated at all, it was a good job by Barker.
“I had to neutralise his attack, I had to break him down.”