Nadia Podoroska defeated Elina Svitolina (5th in the WTA ranking) by 6-2 and 6-4 and he got into the semifinals of Roland Garros but he not only achieved that. It also snapped an 18-year streak without an Argentine beating a Top 5 in a Grand Slam tournament.
In the second round of Roland Garros 2002, Clarisa Fernández (aged 20) defeated Kim Clijsters, who was No. 4 in the world. In that year, Clarisa would reach the semifinals in Paris, her best performance in a Grand Slam tournament.
A few years later, in Miami 2009, Gisela Dulko would also manage to beat one of the Top 5. Argentina beat Jelena Jankovic (3rd in the WTA at that time)