|Representing the Dominican Republic|
|2008 Beijing||58 kg|
|1999 Edmonton||54 kg|
|2011 Gyeongju||58 kg|
|Pan American Games|
|2007 Rio de Janeiro||58 kg|
|2011 Guadalajara||58 kg|
|2003 Santo Domingo||58 kg|
|Central American and Caribbean Games|
|2002 San Salvador||54 kg|
|2010 Mayaguez||58 kg|
He carried the flag for his delegation at the 2012 Summer Olympics in London. He was favored to win his county's third medal at these games. He competed in the Men's 58 kg (flyweight). He lasted one round and a half. A bad move shattered the meniscus and the anterior cruciate ligament in his right knee. He kept fighting with evident pain, before he limped away in tears.
- Sanguinetti, Pablo (8 August 2012). "Tears at taekwondo: the painful farewell of 2008 medallist Mercedes". Europe Online. Retrieved 8 August 2012.
- profile on the Beijing Olympics official website
- Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill. "Gabriel Mercedes". Olympics at Sports-Reference.com. Sports Reference LLC.
| Flagbearer for Dominican Republic
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