A local celebrity and boxing staple in the Bay Area, the charismatic Mayfield has already beaten former world champion Mauricio Herrera, as well as then-undefeated Raymond Serrano. He won the NABO Super Lightweight Championship in 2011 and defended it successfully twice.
The 24-year-old has also served as a sparring partner for world champions Manny Pacquiao, Antonio Margarito, and Sergio Mora. Mayfield came to boxing late, at age 20, but won 54 of his 58 amateur fights before going on a tear as a professional.
"I am excited to be signing with GCP and look forward to being back in action early in 2016," said Mayfield. "This will give me the opportunity to fight some of the top fighters in the world. I am hard at work preparing, wearing my army fatigues, ready to go duck hunting next year."
Greg Cohen, his new promoter, says Mayfield makes a very welcome addition to the GCP stable of fighters.
"Karim has amazing natural abilities and the personality to become a crossover star," said Cohen. "I'm very happy he's chosen us to help guide his career. We're going to get him back in the ring often, let him sharpen up his amazing skills and then the sky is the limit for this young man."
Cohen says he will announce Mayfield's first appearance under the GCP banner very soon.