|Birth name||Agustín Gilberto Díaz|
|Born||June 6, 1954|
|Class(es)||Snipe, Star, Laser|
|College team||Tulane University|
He began sailing Optimists at the age of eight in Clearwater, Florida. In 1973, he won the IYRU Single-handed dinghy World Youth title in the Laser class. After graduating from Christopher Columbus High School (Miami) in 1972, Diaz sailed for Tulane University, where he studied Mechanical engineering. He was All American on the Tulane Green Wave sailing team in 1973, 1974 and 1975, won the ICSA Coed Dinghy National Championship in 1973 and the ICSA Men's Singlehanded National Championship in 1974, leading the team to win the Leonard M. Fowle Trophy in 1974. That same year he was elected ICSA College Sailor of the Year.
In the Snipe class, he was also world masters champion in 2002, 2004, 2006 y 2012; Western Hemisphere & Orient champion in 1972, 2002 and 2021; North American champion in 1974, 2004, 2006, 2007, 2008 and 2013; and U.S. National champion in 1974, 1980, 2001, 2002, 2006, 2008, 2009, 2010, 2011 and 2018.
Pan American Games
- Silver medal in Snipe at Colombia 1971.
- Silver medal in Snipe at Guadalajara 2011.
- Bronze medal in Snipe at Toronto 2015.