Question:  Dohonna Malik Scott holds notable wins over a boxer that has been challenged twice by who?
Context: Michael "Mike" Bernardo (28 July 1969 – 14 February 2012) was a South African kickboxer and boxer from Cape Town.  Bernardo was known as Beru-chan in Japan, where he has taken part in K-1 World GPs since 1994.  He holds notable wins over Mirko Cro Cop, Andy Hug, Francisco Filho, Branko Cikatic, Stan Longinidis and 3 straight wins over K-1 legend Peter Aerts. Mustapha Haida (born 12 October 1988) is a Moroccan Muay Thai kickboxer who competes in the middleweight and welterweight divisions.  He fought for GLORY, SUPERKOMBAT, Kunlun Fight and Bellator Kickboxing.  Haida holds notable wins over fighters like Andy Souwer, Enriko Kehl, Dzianis Zuev or Abdallah Mabel. Anthony Tyrone "Tony" Thompson (born October 18, 1971) is an American professional boxer.  He has challenged twice for unified world heavyweight titles, in 2008 and 2012, both times against Wladimir Klitschko. Jerrel Venetiaan (born March 9, 1971) is a retired Dutch kickboxer and mixed martial artist who has fought in Pride Fighting Championships, K-1 and RINGS Holland.  In MMA, he holds notable wins against Daijiro Matsui and RINGS veteran Joop Kasteel.  In kickboxing, he was the champion of two K-1 GPs and defeated talented kickboxers such as Remy Bonjasky, Bjorn Bregy, Xhavit Bajrami and Jorgen Kruth. Gianluca Branco (born 20 September 1970) is an Italian professional boxer.  He has held the European super-lightweight title twice, from 2001 to 2002, and 2008 to 2009; the European Union welterweight title from 2012 to 2013; the European welterweight title from 2014 to 2016; and has challenged twice for a world title, in 2004 and 2006.  Gianluca is the younger brother of former boxer Silvio Branco. James Tillis (born July 5, 1957) is a former professional boxer.  Known as "Quick", he was known for his fast hand speed.  Tillis challenged for the WBA world heavyweight title in 1981, but was defeated by fifteen round unanimous decision to Mike Weaver.  Tillis was the first man to go the distance with a prime Mike Tyson in 1986.  He holds notable wins over Ron Stander by TKO 7 in 1980, and the hard punching Earnie Shavers by ten-round decision in 1982.  Tillis fought for the last time in 2001 at the age of 44. Yushin Okami (岡見 勇信 , Okami Yūshin , born July 21, 1981) is a Japanese mixed martial artist currently competing in the Light Heavyweight division of the UFC.  A professional competitor since 2002, Okami has also formerly competed for PRIDE, Pancrase, M-1 Global, World Series of Fighting, and Professional Fighters League.  He holds notable wins over Mark Munoz, Hector Lombard, Alan Belcher (twice),Anderson Silva (Via DQ), Nate Marquardt, former MMA fighter Evan Tanner and Mike Swick. Rodney Glunder (born as "Rodney Faverus", March 1, 1975) is a Dutch-Surinamese semi-retired professional kickboxer, mixed martial artist, professional wrestler and boxer, current actor, entrepreneur, bodybuilder.  He has fought for M-1 Global, Cage Rage, K-1, PRIDE Fighting Championship, RINGS, Glory, Konfrontacja Sztuk Walki, It's Showtime, SuperKombat, SLAMM!!  Events and Art of War Fighting Championship.  Glunder holds notable wins over top contenders Cheick Kongo, Valentijn Overeem, Joe Riggs, Melvin Manhoef, Cyrille Diabaté, Brian Douwes and Gregory Tony. Abraham Roqueñi Iglesias (born April 16, 1978) is a Spanish welterweight kickboxer.  He was the K-1 MAX Spain 2004 tournament winner, and is a former ISKA, WAKO and WFCA world champion.  He holds notable wins over Gago Drago, Luis Reis, Andy Souwer and Artur Kyshenko. Dohonna Malik Scott (born October 16, 1980) is an American professional boxer, known as "King" or "The Noble Artist".  He holds notable wins over former world heavyweight title challengers Alex Leapai and Tony Thompson.
Answer: Wladimir Klitschko