The ATP Buenos Aires (Spanish Abierto de Buenos Aires) is an annual tennis event for male tennis players held in Buenos Aires, Argentina. The tournament is an ATP World Tour 250 series event on the Association of Tennis Professionals (ATP) tour and it is played on outdoor clay courts at the 5,500 capacity Buenos Aires Lawn Tennis Club, in the Palermo barrio (neighbourhood). Usually held in February, it includes both a men's singles and a men's doubles tournament. Between 1970 and 1989 it was part of the Grand Prix tennis circuit.
Its sponsored name is currently Copa Claro. Previously the event was known as South American International Championships, South American Open, Copa AT&T and Copa Telmex.