Juan Pablo Varillas defeated Dominic Thiem 6–4, 6–4 in the second round of the ATP 250 Buenos Aires tournament on clay on 16 February 2023. The Peruvian claimed a straight-sets victory over the Austrian former US Open champion, demonstrating control throughout both sets on the surface where Thiem has historically excelled. Varillas' composed performance secured his passage to the quarter-finals and marked a significant scalp against an opponent of Thiem's pedigree. The result underscores Varillas' growing confidence on clay and his capacity to trouble established players in South American tournaments.