Its official: Arthur Abraham is going to challenge WBO Super-Middleweight Champion Robert Stieglitz for his crown at o2 World, Berlin. Sauerland Event and SES-Boxing are proud to present this fight as the main event on August 25.br “I’m happy that this fight will take place at o2 World. I was hoping for another chance to show my skills in this incredible arena in front of as many fans as possible. I am looking forward to entertain them again, like I did back in 2009 with my last round knockout against Jermain Taylor,” said Arthur Abraham.