Gastón Gaudio (born December 9, 1978), nicknamed El Gato (The Cat in Spanish), is a professional tennis player from Argentina. He won the Roland Garros Men's Singles title in 2004 by defeating compatriot Guillermo Coria, 0-6 3-6 6-4 6-1 8-6, in an unprecedented all-Argentinean final. He reached the top 10 for the first time after winning the Grand Slam title.
Gaudio won first ATP tournament in Barcelona without losing a set where he defeated world #1 Lleyton Hewitt in the semi finals and then trashed Albert Costa 6-4 6-0 6-2 in the final, who later would become the French Open champion that year.
Gaudio made the fourth round of the French Open losing to Juan Carlos Ferrero 6-7 6-1 6-7 6-2 6-4, while leading 4-1 in the final set and this inability to close out matches when in a winning position has been a constant fixture in his career.
Gaudio also qualified again for the Tennis Masters Cup where he made the semi finals defeating Mariano Puerta and Fernando Gonzalez and lost to Nikolay Davydenko in the round robin, before losing to Roger Federer 6-0 6-0 in the semi finals.