Gumy reached the final of the international junior championships of Venezuela in 1990 and was in the second round of the junior tournament of Wimbledon . The following year he became a professional tennis player and initially played on lower-class satellite tournaments. From 1992 he played more and more on the ATP Challenger Tour , but was not able to record his first notable success until April 1994 when he entered the finals in São Paulo . The following month he won two individual titles out of a total of six career titles on the ATP Challenger Tour in Budapest and Bochum . He celebrated his greatest success on the ATP World Tour in 1996 when he won the tournament in Santiago de Chile , when he defeated local hero Marcelo Ríos in two sets in the final . He reached his highest ranking in the tennis world rankings in 1996 with position 39 in singles and in 1994 with position 232 in doubles.
His best individual result in a Grand Slam tournament was reaching the third round of the Australian Open , the French Open and the US Open . In doubles he was never able to qualify for one of the Grand Slam tournaments.
Gumy played 14 individual games between 1996 and 2000 for the Argentine Davis Cup team, where he appeared twice in the first round of the world group. In the first round encounter against Mexico in 1996, he won his first individual in just five sets against Leonardo Lavalle , but gave up his second individual game. Mexico won 3-2. In 1998 Argentina lost again 3-2 in Slovakia , here too Gumy won his first game against Karol Kučera and gave the second individual against Dominik Hrbatý . His balance was 7: 7. At the Pan American Games in 1995 he won the gold medal in tennis singles, defeating Javier Frana in the final . At the 1996 Summer Olympics , he competed in singles for Argentina. However, he was defeated in his first round encounter by Venezuelan Nicolás Pereira in two sets.
Argentina
Santiago de Chile