On 25 August the CEO of Golden Boy Promotions, Richard Schaefer, announced that Márquez had decided to stay at lightweight and defend his unified WBA, WBO, "Ring", and lineal titles against Katsidis on 27 November at the MGM Grand. Golden Boy Promotions founder Oscar De La Hoya titled the event as "Warriors", and it was to be Katsidis' first time headlining an "HBO World Championship Boxing" broadcast (having twice previously headlined HBO's "Boxing After Dark", against Casamayor and Díaz). Tragedy occurred during Katsidis' pre-fight preparation and training in Thailand, when his brother Stathi Katsidis died on 19 October.