By Harry Davies Amanda Serrano’s world title fight against Nina Meinke was cancelled just moments after Jake Paul knocked out Ryan Bourland. Serrano was scheduled to defend her undisputed women’s featherweight world titles against Meinke in Puerto Rico on Saturday night, but a last-minute eye injury forced her out of the fight. Serrano’s close friend and Most Valuable Promotions business partner Paul was in chief support on the card as he picked up a first round knockout win against Ryan Bourland. Paul had just finished his post-fight interview and was in the ring for longer than he expected a…