Paulo Costa responds to Bogdan Guskov's callout

Brazilian middleweight Paulo Costa has responded to a challenge from Bogdan Guskov. The post does not provide details about the nature of Costa's response or whether he accepted the fight. Guskov, a rising Russian contender, has been actively calling out opponents on social media. The exchange suggests ongoing negotiations or public interest in a potential matchup between the two fighters. Further details about Costa's response or any official fight agreement remain unclear at this time.