Question: Which Italian amateur boxer beat Tumba Silva in the 2012 Olympics?

full_context: Document 1: Davilson Morais: Davilson Morais (born February 3, 1989) is a Cabo Verdean boxer. He competed at the 2016 Summer Olympics in the men's super heavyweight event, in which he was eliminated in the round of 16 by Joe Joyce.
Document 2: Baboo Da Silva: Mauricio "Baboo" Da Silva (born November 28, 1967) is a Brazilian kyokushin kaikan full contact karate practitioner and former professional kickboxer and mixed martial artist. He is a professional coach and trainer of K-1 and MMA (Mixed Martial Arts), who has trained a number of world class fighters including Francisco Filho (martial artist), Glaube Feitosa, Andrews Nakahara, Ewerton Teixeira, Ray Sefo, Aleksandr Pitchkounov, Takumi Sato, Jan Soukup, Kou Tasei (aka Hong Tae Seong), Jan Nortje, Doug Viney, Mighty Mo (kickboxer) and Akebono Taro. From 1998 to 2004 he worked as the trainer and sparring partner for Francisco Filho. He lived in Tokyo, Japan from 2005 to December 2010 and trained fighters from the IKO1 Kyokushin - Team Ichigeki and other fighters from visiting teams at the Ichigeki Plaza. He fought in the K-1 PREMIUM 2003 Dynamite!! and also in the Ichigeki events in Japan.
Document 3: Ruslan Chagaev: Ruslan Shamilevich Chagaev (Tatar: Руслан Шамил улы Чагаев , "Ruslan Şamil ulı Çağayev"; Uzbek: "Ruslan Shamil'evich Chagaev" ; Russian: Руслан Шамилович Чагаев ); born 19 October 1978) is an Uzbek former professional boxer who competed from 1997 to 2016. He is a two-time WBA heavyweight champion, having held the full world title from 2007 to 2009, and the Regular title from 2014 to 2016. To date, Chagaev remains the only Asian boxer in the history of the sport to hold a heavyweight world title by any of the four major sanctioning bodies.
Document 4: Oleksandr Usyk: Oleksandr Oleksandrovych Usyk (Ukrainian: Олекса́ндр Олекса́ндрович У́сик ) is a Ukrainian professional boxer who has held the WBO junior heavyweight title since 2016. As of May 2017 he is ranked as the world's best in the division by "The Ring" magazine, the Transnational Boxing Rankings Board, and BoxRec. As an amateur, Usyk won gold medals at the 2011 World Championships and 2012 Olympics, both in the heavyweight division.
Document 5: Tumba Silva: Tumba Silva is an Angolan boxer. At the 2012 Summer Olympics, he competed in the Men's heavyweight, but lost in a walkover to Clemente Russo in the first round after missing the weigh-in.
Document 6: 2016 AIBA Youth World Boxing Championships: The 2016 AIBA Youth World Boxing Championships will be held in Saint Petersburg, Russia, from 17 to 26 November 2016. The competition is under the supervision of the world's governing body for amateur boxing AIBA and is the junior version of the World Amateur Boxing Championships. The competition is open to boxers born in 1998 and 1999.
Document 7: Clemente Russo: Clemente Russo (born 27 July 1982) is an Italian amateur boxer best known for winning Gold at the 2007 and 2013 World Amateur Boxing Championships at heavyweight (201 lbs limit). He currently boxes for the Italia Thunder team in the World Series of Boxing league. He has also signed up for the new AIBA professional league, the APB, which will launch in autumn 2013.
Document 8: James Obede Toney: James Obede "Hot Ice" Toney ( (1980--) 05 1980 (age (2017)-(1980)-((11)<(08)or(11)==(08)and(30)<(05)) ) ) born in Accra is a Ghanaian professional middle/super middle/light heavy/cruiserweight boxer of the 2000s and 2010s who won the African Boxing Union (ABU) middleweight title, World Boxing Council (WBC) International middleweight title, and Commonwealth middleweight title, and was a challenger for the World Boxing Council (WBC) International middleweight title against Sergey Tatevosyan, and North American Boxing Federation (NABF) super middleweight title, North American Boxing Association (NABA) super middleweight title, and World Boxing Council (WBC) Continental Americas super middleweight title, against Lucian Bute, his professional fighting weight varied from 157 lb , i.e. middleweight to 185 lb , i.e. cruiserweight.
Document 9: Silviu Vulc: Silviu Dorin Vulc more commonly known as Silviu Vulc is a Romanian heavyweight mixed martial artist. Silviu Vulc spent his early career boxing in Romania, he then moved to Russia to train with Red Devil Sport Club team mates with Fedor Emelianenko and Alexander Emelianenko. Vulc spent two years there training and fighting. During this time he had ten MMA fights with eight wins and three losses, the first seven fights being semi-professional before moving into the professional league. Vulc had a short professional career, defeating Rodrigo Mendes in the Desert Combat Challenge in Israel and losing twice. His last fight being in 2008 for M-1 Global. Silviu has spent most of his time and energy over the years coaching others in boxing and MMA around the world including time spent in Russia, Romania and London, England.
Document 10: Roy Jones Jr.: Roy Levesta Jones Jr. (born January 16, 1969) is an American professional boxer, boxing commentator, boxing trainer, rapper, and actor who holds dual American and Russian citizenship. He is a six-time former world champion in four weight classes, having held titles at middleweight, super middleweight, light heavyweight, and heavyweight; and is the only boxer in history to start his professional career at light middleweight and go on to win a heavyweight title. As an amateur he represented the United States at the 1988 Summer Olympics, winning a silver medal in the light middleweight division.
Document 11: Charles Manyuchi: Charles Manyuchi is a Zimbabwean professional boxer who is the WBC, international welterweight champion since March 2014. In November 2014, he successfully defended his WBC crown in a Lusaka, Zambia fight against an opponent from Colombia. In 2014 he was awarded the Zimbabwe's Sportsperson of the year accolade. In July 2015 against an Italian boxer in Friuli-Venezia Giulia, he defended his crown successfully.In 2017 saw the fall of great man who was bound for glory and wider recognition internationally when he lost his title to Quadratilo from Singapore in what was referred as a huge upset in the boxing world especially to the fans back home. Coming back home,he received unwelcome remarks and comments from many fans but he however had support from government claiming to sue those who continued to attack him. The are currently plans to have a rematch.
Document 12: Alessia Mesiano: Alessia Mesiano (born 7 December 1991) is an Italian amateur boxer, 2016 AIBA world champion in the 57 kg.
Document 13: Anthony Joshua: As of May 2017, Joshua is ranked as the world's best heavyweight by the Transnational Boxing Rankings Board and BoxRec, and second best by "The Ring". His knockout-to-win ratio stands at 100%. Joshua is the second British boxer, after James DeGale, to win both a gold medal at the Olympics and a world title by a major professional sanctioning body, as well as being the first British heavyweight to do so. He is also the second boxer, after Joe Frazier, to win a world heavyweight title whilst still reigning as Olympic champion at the top weight.
Document 14: Antônio Silva (fighter): Antônio Carlos Silva (born September 14, 1979) is a Brazilian mixed martial artist who formerly competed in the heavyweight division of the UFC. He is a former EliteXC Heavyweight Champion, a former Cage Rage World Heavyweight Champion and a former Cage Warriors Super Heavyweight Champion. He has also competed for K-1 Hero's, BodogFIGHT, Strikeforce and World Victory Road. Known for being one of the five men (along with Tsuyoshi Kohsaka, Fabrício Werdum, Dan Henderson, and Matt Mitrione) to defeat Fedor Emelianenko in mixed martial arts competition.
Document 15: Andrew Murray (Guyanese boxer): Andrew "The Eagle" Murray (1 July 1971 — 26 January 2002 (aged 30)) born in Georgetown was a Guyanese professional welter/light middle/middleweight boxer of the 1990s and 2000s who won the World Boxing Council (WBC) FECARBOX welterweight title, World Boxing Association (WBA) Fedelatin welterweight title, and Commonwealth welterweight title, and was a challenger for the World Boxing Association (WBA) World welterweight title against Ike Quartey, World Boxing Union (WBU) welterweight title against Michele Piccirillo, and World Boxing Organization (WBO) North American Boxing Organization (NABO) light middleweight title against Fathi Missaoui, his professional fighting weight varied from 145 lb , i.e. welterweight to 156 lb , i.e. middleweight. Andrew Murray was trained by Emanuel Steward, and was the Vice-President of the Guyana Amateur Boxing Board and was training several young boxers, and he had coached Hugo Lewis to the Guyanese super featherweight title on 26 December 2001. Andrew Murray died in a traffic collision on the Soesdyke-Linden Highway early in the morning of Sunday 27 January 2002, he had been in Linden promoting a fight card and was on his way back to Georgetown.
ground_truth: Clemente Russo