Juan Hernández Sierra

Juan Hernández Sierra (born March 16, 1969) is a retired 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 at his Olympic debut he repeated that feat in Atlanta, United States (1996).
Four times he became world champion in his division, in 1991, 1993, 1995 and 1999.

1992

• 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

1996

• Defeated Joszef Nagy (Hungary) RSC 2
• Defeated Vadim Mezga (Bulgaria) 12-2
• Defeated Nurhan Smanov (Kazakhstan) 16-8
• Defeated Marian Simion (Romania) 20-7
• Lost to Oleg Saitov (Russia) 9-14

2000

• Defeated Stephan Nzue Mba (Gabon) RSC 3
• Defeated Mohamed Salad Marmouri (Tunisia) RSC 3
• Lost to Yermakhan Ibraimov (Kazakhstan) 9-16