Undefeated Amanda Serrano joins Boxing 360 stable NEW YORK  – Undefeated title challenger Amanda “The Real Deal” Serrano has signed an exclusive promotional with Boxing 360 and joined the New York-based company’s growing stable of future champions. The 23-year-old Serrano (8-0-1, 4 KOs), who was born in Puerto Rico, now fighting out of Brooklyn, is…