At the 2008 Summer Olympics in Beijing Di Buò finished his ranking round with a total of 670 points, nine points behind leader Juan René Serrano.
Serrano was named the flag bearer for the Mexico at the 2011 Pan American Games.
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In the second round Serrano was too strong for Daniel Morillo (112–111) and via Maksim Kunda (110–106) in the third round he advanced to the quarter finals.
San Juan | Juan Carlos I of Spain | René Descartes | Don Juan | Santurce, San Juan, Puerto Rico | Juan Gabriel | Juan Perón | Juan Pablo Montoya | René Char | René Magritte | Strait of Juan de Fuca | Juan Ramón Jiménez | Juan Luna | François-René de Chateaubriand | San Juan, Metro Manila | San Juan Islands | San Juan, Argentina | René Goscinny | Los Serrano | Leon René | Andres Serrano | San Juan del Sur | René Jacobs | Rene Daalder | Juan Manuel Santos | Juan Gris | Juan | Rene Russo | Old San Juan | Juan Mónaco |
Prominent flag bearers included Canadian football star Christine Sinclair, American rower Jason Read, Mexican archer Juan René Serrano and Brazilian table tennis player Hugo Hoyama, who is the all-time Pan American Games leader in total medals won for Brazil.
At the 2008 Summer Olympics in Beijing Champia finished his ranking round with a total of 678 points, just one point behind Juan René Serrano and equal with Viktor Ruban and scoring more bull's eyes than Serrano.