By Jake Donovan

Full Quarterfinals matchups and results - updated Tuesday, August 19 10:30AM EST. Winning fighters in this round are all guaranteed medals.

Click the following for results in the preliminary rounds:

BOXINGSCENE.COM 2008 OLYMPIC BOXING ROUND ONE (ROUND OF 32) SCOREBOARD

BOXINGSCENE.COM 2008 OLYMPIC BOXING ROUND TWO (ROUND OF 16) SCOREBOARD

Light Flyweight (106 lb, 48 kg):

Paddy Barnes (Ireland) W-4 Lukasz Maszcczyk (Poland), 11-5

Zou Shimming (China) W-4 Birzhan Zhakypov (Kazakhstan), 9-3

Purevdori Serdamba (Mongolia) W-4 Amnat Ruanroeng (Thailand), 5-2

Yampier Hernandez (Cuba) W-4 Paulo Carvalho (Brazil), 21-6

Flyweight (112 lb, 51 kg):

McWilliams Arroyo (Puerto Rico) vs. Andry Laffita (Cuba)

Georfy Balakshin (Russia) vs. Jitender Kumar (India)

Vincenzo Picardi (Italy) vs. Walid Cherif (Tunisia)

Somjit Jongjohor (Thailand) vs. Anvar Yunusov (Tajikistan)

Bantamweight (119 lb, 54 kg):

Yankiel Leon (Cuba) W-4 Worapoj Petchkoom (Thailand), 10-2

Bruno Julie (Mauritius) W-4 Héctor Manzanilla (Venezuela), 13-9

Veaceslav Gojan (Moldova) W-4 Akhil Kumar (India), 10-3

Badar-Uugan Enkhbatyn (Mongolia) W-4 Khumiso Ikgopoleng (Botswana), 15-2

Featherweight (125 lb, 57 kg):

Yakup Kılıç (Turkey) W-4 Abdelkader Chadi (Algeria), 13-6

Vasyl Lomachenko (Ukraine) W-4 Yang Li (China), 12-3

Khedafi Djelkhir (France) W-4 Arturo Santos-Reyes (Mexico), 14-9

Shahin Imranov (Azerbaijan) W-4 Idel Torriente (Cuba), 16-14

Lightweight (132 lb, 60 kg):

Hrachik Javakhyan (Armenia) W-WALKOVER Jong Sub-Baik (South Korea)

Aleksei Tishchenko (Russia) W-4 Darley Perez (Colombia), 13-5

Yordenis Ugas (Cuba) W-4 Georgian Popescu (Romania), 11-7

Daouda Sow (France) W-4 Hu Qing (China), 9-6

Light Welterweight (139 lb, 64 kg):

Manus Boonjumnong (Thailand) W-4 Serik Sapiyev (Kazakhstan), 7-5

Roniel Iglesias (Cuba) W-4 Gennady Kovalev (Russia) 5-2

Felix Diaz-Guzman (Dominican Republic) W-4 Morteza Sepahvand (Iran) 11-6

Alexis Vastine (France) W-4 Uranchimeng Munkh-Erdene (Mongolia) 12-4

Welterweight (152 lb, 69 kg):

Carlos Banteaux Suarez (Cuba) W-4 Hosam Bakr Abdin (Egypt), 10-2

Silamu Hanati (China) W-4 Tureano Johnson (Bahamas), 14-4

Bakhyt Saesekbayev (Kazakhstan) W-4 Dishold Mahmudov (Uzbekistan), 12-7

Jung-Joo Kim (South Korea) W-4 Demetrius Andrade (United States), 11-9

Middleweight (165 lb, 78 kg):

Alfonso Blanco (Venezuela) vs. Darren Sutherland (Ireland)

Bakhtiyar Artayev (Kazakhstan) vs. James Degale (Great Britain)

Elshod Rasulov (Uzbekistan) vs Emilio Correa (Cuba)

Carlos Góngora (Ecuador) vs  Vijende Kumar (India)

Light Heavyweight (178 lb, 81 kg):

Tony Jeffries (Great Britain) W-4 Imre Szello, 10-2

Kenny Egan (Ireland) W-4 Washington Silva (Brazil), 8-0

Zhang Xioping (China) W-4  Abdelhafid Benchabla (Algeria), 12-7

Yerkebulan Syhnaliyev (Kazakhstan) DQ-3 (1:43) Dzhakhon Kurbanov (Tajikistan)

Heavyweight (201 lb, 91 kg):

Osmay Acosta (Cuba) W-4 Elias Pavlidis (Greece), 7-4

Rakhim Chakhkeiv (Russia) W-4 John M’Bumba (France), 18-9

Deontay Wilder (United States) W-4 (Countback) Mohamed Arjaoui (Morocco), +10,10

Clemente Russo (Italy) W-4 Oleksandr Usyk (Ukraine), 7-4

Super Heavyweight (+201 lb, +91 kg):

Vyacheslav Glazkov (Ukraine) W-4 Newfel Ouatah (Algeria), 10-4

Zhilei Zhang (China) W-4 Ruslan Myrsatayev (Kazakhstan), 12-2

Roberto Cammarelle (Italy) W-4 Oscar Rivas (Colombia), 9-5

David Price (Great Britain) RSC-1 (2:00) Jaroslavas Jakšto (Lithuania)

Jake Donovan is a voting member of the Boxing Writers Association of America. Comments/questions can be submitted to JakeNDaBox@gmail.com .