Question: Who held notable victories against the Lebanese-born Syrian-German professional boxer?
Context: Bryan Lee Vera (born December 28, 1981) is an American professional boxer who fights at super middleweight.  He is best known for his memorable and notable victories over then-undefeated Andy Lee in 2008, former world champion Sergio Mora (twice, in 2011 and 2012) and Serhiy Dzinziruk in 2013.  Vera currently trains in Cedar Park, Texas. Owen T. Van Natta (born November 12, 1969) is an American businessman.  He has held notable positions in various media companies, including Amazon.com, Facebook, Myspace and Zynga.  Van Natta holds a bachelor's degree in English and American literature from the University of California, Santa Cruz. Dmitry Chudinov (born 15 September 1986) is a Russian professional boxer.  He is a former WBA interim middleweight champion, and holds notable victories over Grady Brewer and Jorge Navarro.  His brother Fedor Chudinov is also a professional boxer. 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. 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. Ronald "Ron" Lyle (February 12, 1941 – November 26, 2011) was an American professional boxer who competed from 1971 to 1980, and in 1995.  He challenged once for the undisputed world heavyweight title, losing to Muhammad Ali in 1975.  Lyle was known for his punching power, crowd-pleasing fighting style, as well as courage and determination inside the ring.  He held notable wins over Buster Mathis, Oscar Bonavena, Jimmy Ellis, Earnie Shavers, Joe Bugner, and Scott LeDoux, but is best known for his slugfest against George Foreman in 1976, which won Fight of the Year honors by "The Ring" magazine. Mikhail Fyodorovich Kvetsinsky (Russian: Михаи́л Фёдорович Квецинский) (January 3, 1866 – March 31, 1923), also known as Michael (von) Kwetzinsky, was a Russian officer and a military administrator.  He held notable command posts in the Russian Far East, during the Russo-Japanese War, during the First World War and during the Russian Civil War, when he was one of the leaders of the White Army of the North during the North Russia Intervention.  Kvetsinsky became a Major-General in 1910 and a Lieutenant-General in 1915. Kiyoshi Tamura (田村潔司 , "Tamura Kiyoshi" , born December 17, 1969 in Okayama, Okayama) is a Japanese middleweight professional wrestler and mixed martial artist.  Once a student of legendary pro wrestlers Billy Robinson, Nobuhiko Takada and Akira Maeda, Tamura is known for his skill in catch wrestling as well as his ability to deliver exciting professional wrestling bouts.  He has competed in some form or another for the following organizations: Universal Wrestling Federation, UWF International, Fighting Network RINGS, K-1, PRIDE, and U-STYLE, his own promotion, often fighting much larger opponents.  In mixed martial arts, he holds notable victories over Renzo Gracie, Jeremy Horn, Ikuhisa Minowa, Masakatsu Funaki and Kazushi Sakuraba. Jack Hermansson (born June 10, 1988) is a Swedish mixed martial artist currently living in and fighting out of Norway.  He competes in the Middleweight division of the Ultimate Fighting Championship.  He is the former champion in Cage Warriors and Warrior Fight Series.  In 2012-2013 he fought in the United States in the Bellator MMA promotion.  On the European circuit he held notable victories over UFC veteran Karlos Vemola and Bellator veteran Norman Paraisy among others. Clayton "The Carpenter" Guida ( ; born December 8, 1981) is an American professional mixed martial artist, fighting in the UFC as a Featherweight.  A professional competitor since 2003, Guida has also formerly competed for Strikeforce, the WEC, King of the Cage, and Shooto.  Guida was the inaugural Strikeforce Lightweight Champion He holds notable victories over former UFC Lightweight Champions Rafael Dos Anjos and Anthony Pettis.
Answer: Johann Duhaupas