The Gran Premio San Isidro - Copa Dr. Melchor Ángel Posse is a Group 1 thoroughbred horse race run at Hipódromo de San Isidro in Buenos Aires, Argentina, open to horses three-years-old and older.
It is run over a distance of 1600 metres (0.99 mi) on the turf.
[1] The Gran Premio San Isidro has been run as a Group 1 race since 1981.
[2] The Gran Premio 25 de Mayo was known as the Premio San Isidro or Gran Premio San Isidro until 1959.
[3] Speed record: Greatest winning margin: Most wins: Most wins by a jockey: Most wins by a trainer: Most wins by an owner: Most wins by a breeder: ƒ indicates a filly/mare *1989 resulted in a dead heat.