Juan Hernández Sierra

Juan Hernández Sierra (born March 16, 1969) is a retired amateur boxer from Cuba, who competed in the welterweight (< 67 kg) division during the 1990s. He represented his native country at three consecutive Summer Olympics, starting in 1992 in Barcelona, Spain. After having won silver on his Olympic debut he repeated that feat in Atlanta, United States in 1996.

He became world champion in his division four times, in 1991, 1993, 1995 and 1999.

Olympic results
1992 1996 2000
 * Defeated Said Bennajem (France) 6-0
 * Defeated Jin-Chul Jun (South Korea) RSC 2
 * Defeated Soren Antman (Sweden) RSC 3
 * Defeated Aníbal Acevedo (Puerto Rico) 11-2
 * Lost to Michael Carruth (Ireland) 10-13
 * Defeated Jozsef Nagy (Hungary) RSC 2
 * Defeated Vadim Mezga (Belarus) 12-2
 * Defeated Nurzhan Smanov (Kazakhstan) 16-8
 * Defeated Marian Simion (Romania) 20-7
 * Lost to Oleg Saitov (Russia) 9-14
 * Defeated Stephan Nzue Mba (Gabon) RSC 3
 * Defeated Mohamed Salad Marmouri (Tunisia) RSC 3
 * Lost to Yermakhan Ibraimov (Kazakhstan) 9-16