In a career spanning 19 years, he reached the quarter finals at the French Open in 1989 by beating Carl Limberger, Tim Mayotte, Claudio Pistolesi and Sergi Bruguera before losing to champion Michael Chang. He also got to the fourth round of both the US Open and French Open in 1988. He represented Haiti in the Olympics in Los Angeles in 1984, in Seoul in 1988, and in Atlanta in 1996 and won 3 ATP Tour World titles in Athens, Genoa, and Berlin. At the French Open in 1994, he defeated David Prinosil, 14/12 in the fifth set and broke the previous record of the longest match in the number of games in the history of the French Open since the open era previously held by Emilio Sanchez. In 1987, his final at the Swiss Indoors against Yannick Noah from France, was the first ATP World Tour tennis final between two players of color in men's professional tennis history. After a break from the pro circuit, Agénor made a comeback in 1999 becoming, at 35 years of age, the oldest player to reach top 100 (ATP ranked #88) in the world since Jimmy Connors did it in 1991. In 2000, he represented and led the Lido Luzern Tennis Club in Switzerland to its first Swiss National title in 100 years. In 2001, at 37 years of age, he finished the year ATP ranked #186 appearing in a final against David Nalbandian from Argentina.