"The Haitian Sensation" and "l'Haitien de Bordeaux"

Ronald started to play tennis at the age of 10 in Congo, Africa, and discovered competitive tennis in Bordeaux France at age 14. Under the wing of his brother Lionel, Ronald was able to combine intensive training and competition while attending high school. He finished the year 1982 ranked number 8 in the year-end Junior World Rankings, winning the Gold Medal for Haiti at the Central American games in Havana, Cuba. Ronald turned pro and earned his first ATP point in 1983 and was ranked #793 in the world.

He represented Haiti at the 1984 Olympics in Los Angeles, and made one of the biggest ranking jump in the world ranking history, moving from #416 to #49 in 9 months. He was a first time tour finalist in Gstaad and Bordeaux in 1987, and was also a finalist in Basel, Switzerland, losing to Yannick Noah from France, in what would be the first ATP Tour final featuring 2 Black tennis players in the history of the game.

In 1988 he reached the fourth round at both the French Open and the US Open, and made a semi final appearance at the Italian Open in Rome, defeating Andre Agassi for the second time, Aaron Krickstein, and world number 1, Mats Wilander from Sweden. In 1989, he won his first ATP tour event in Athenes, Greece, defeating world's number 6 Kent Carlsson from Sweden in the final. He was a first time Grand Slam quarter finalist, losing to eventual Champion, Michael Chang, and achieved a career best ranking of 22.

He also defeated Andre Agassi for the 3rd time in Tokyo, Japan (Ronald is the only player that holds a 3-0 record against Agassi, and in 1990, was nicknamed " The Haitian Sensation ", Ronald won the ATP tour events of Berlin, Germany, and Genova, Italy, and recorded the fastest serve of the year with 207 kmh. In 1994, Ronald reached the third round at the French Open, defeating David Prinosil from Germany in the 2nd round, in what would be the longest match of the history of the French Open since the open era in the number of games, setting up a record of 71 games. Ronald came back from a 2 sets down deficit to win 14/12 in the 5th set. Ronald's performance has been recorded in the Europeen Guinness Book of World Records.

In 1996 and 1997, Ronald took a break from the game, playing only 3 events and in 1998 was on the road once again to achieve what would be one of the most incredible come backs in the history of the game.At age 33, ranked #790 in the world with only 5 ATP points left, with no wild cards given to him in any main draw tournaments, Ronald played Futures, Satellite, and Challengers to regain a spot in the top 100 in 1999 and became at 35 years of age the first player to finish the year in the top 100 since Jimmy Connors in 1991.

In 2000, Ronald played all four Grand Slams for the first time since 1994, and won a round at the French Open and also played team matches in Switzerland, representing and leading the Lido Luzern Tennis Club to its first National title in 100 years. In 2001 and at 37 years of age, Ronald finished the year ranked ATP #186 appearing in a final against David Nalbandian from Argentina, with a highlight at the Master Series in Montreal, Canada, where defeated Paradorn Shrichapan for the third time losing to worl'ds number 1, Gustavo Kuerten in 3 sets. In September of that year, Ronald reached the last round at the qualifying event of the US Open.