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Gamboa made his professional boxing debut on April 27, 2007, in Hamburg, Germany against Alexan Manvelyan. Gamboa put Manvelyan on the canvas in the third round and beat up his foe throughout the fight for the unanimous decision victory. Two months later, he defeated Araik Sachbazjan by fourth round technical knockout. After winning his next four fights, Gamboa made his United States debut on October 30, 2007, at the Seminole Hard Rock Hotel and Casino in Hollywood, Florida against Adailton De Jesus. De Jesus was dropped to the canvas less than 30 seconds into the fight. A Gamboa slip in the fourth round was ruled a knockdown by the referee. Gamboa's relentless pressure eventually forced a stoppage in the sixth and final round.
Gamboa fought Gilberto Luque on January 5, 2008, at Bally's Hotel & Casino in Atlantic City, New Jersey. Gamboa sent his opponent to the canvas after only 30 seconds with a left hand. After two more knockdowns the referee stopped the fight. On February 22, 2008 in Fort Lauderdale, Florida, he made his American television debut against Johnnie Edwards. Gamboa knocked Edwards down in the first 30 seconds of the fight after connecting with a left hand to the head. Edwards got up, but was met with left hand punches from Gamboa ending with two consecutive right hands that knocked Edwards down for the second and final time as the referee moved in and halted the fight in round one.
On May 17, 2008, at Buffalo Bill's Star Arena in Primm, Nevada, Gamboa fought Darling Jimenez. Gamboa started off well in the first three rounds of the fight, swarming Jimenez and hitting him with punches over and over. Gamboa looked flustered in the fourth round and began showing signs of fatigue. He got careless and was knocked down by a right hand behind the ear from Jimenez. Gamboa got up and finished the fight strong, winning by unanimous decision. After the fight, Gamboa’s promoter Ahmet Öner fired his trainer Osmiri Fernandez, replacing him with Ismeal Salas.
On July 18, 2008, Gamboa scored a first round technical knockout victory over Al Seeger in a fight that took place at Buffalo Bill's Star Arena in Primm, Nevada. A left hook to the body set up a right hand that landed across Seeger's face, causing him to collapse backwards flat onto the canvas. The referee stepped over Seeger without bothering to count, officially stopping the bout.
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