Question: Who held notable victories against the Lebanese-born Syrian-German professional boxer?
Related documents: [0]  [DOC] Manuel Charr (born Mahmoud Omeirat Charr; 10 October 1984) is a Lebanese-born Syrian-German professional boxer who has challenged once for the WBC heavyweight title. [END] 
[1]  [DOC] Johann Duhaupas (born 5 February 1981) is a French professional boxer and world heavyweight title challenger. He is the current WBC Silver heavyweight champion and a former European Union heavyweight champion. Duhaupas is a pressure fighter in style, known for his stiff jab and iron chin. He holds notable victories over Manuel Charr and Robert Helenius. [END] 
Answer: 
Johann Duhaupas
Johann Duhaupas