Luis Ortiz recovered from a double knockdown to secure a stoppage victory against heavyweight rival Charles Martin.
Martin dropped the Cuban star twice in the opening five rounds before Ortiz produced a rallying comeback to drop his opponent in the sixth period.
The American was later sent crashing to the canvas again with his hand caught in the rope before rising, but the referee ended the contest after a brief return to his feet.
Ortiz was delighted with his performance after the fight : “I was very focused for this fight. I was never worried, my head trainer German Caicedo just reminded me to work the jab and it will create the openings I needed.
“My corner reminded me to remain calm, just stick to my strengths and things would go my way. My message is for all of the heavyweights out there, If you want to fight for the title, you have to go through me.
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“I knew this was going to be fireworks from the start. He dropped me twice; I finished him.”
Both fighters were sent crashing to the canvas in the opening round with Martin first crumbling to the floor, but the referee Frank Santore Jr. ruled the knockdown as a slip after he trod on his Cuban rival’s foot.
Martin later produced a telegraphed left-hand to score a clean knockdown of his own but Ortiz beat the count of eight.
A battle of the southpaw jabs emerged in rounds two and three with Martin struggling to deal with the pace that was established by Ortiz.
However the American made another breakthrough in the closing stages of the fourth stanza, landing a stiff jab to send the 42-year-old Cuban to the floor for a second time.
Despite the early knockdowns Ortiz burst into character in the sixth starting fast with a crisp shot that immediately stiffened the legs of his opponent.
A barrage of shots sent his rival crumbling to the canvas for the first time in the period which Martin recovered from but never look fully composed.
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Shortly after, Ortiz splattered his opponent to the ground again which left his hand tangled in the ring ropes with the referee helping him remove his hand.
However despite Martin briefly beating the count Ortiz resumed his attack and the referee called a halt to the bout handing Ortiz his 28th stoppage victory.
The Cuban was down on the scorecards at the close of the contest with the judges seeing the exchanges at 48-45, 48-45 and 47-46 in Martin’s favour.
Ortiz will now look to restore his stance on the world-level scene at heavyweight after winning the IBF eliminator with his opponent ranked at No.1.
Also on the card Frank Sanchez produced a dominant display against Christian Hammer to take the latest successful step on his heavyweight journey by unanimous decision.
Jonathan Rice also score his second consecutive victory over Michael Coffie at heavyweight with unanimous decision victory after his previous stoppage in the opening meeting.