RIO DE JANEIRO, May 18 -- Defending champions Atletico Nacional of Colombia were eliminated from the Copa Libertadores on Thursday after a 1-0 defeat to Brazil's Botafogo at Rio's Olympic stadium.

Rodrigo Pimpao struck in the 51st minute after a defence-splitting pass from Rodrigo Lindoso and the hosts defended resolutely thereafter to secure their third win from five matches.

Botafogo are now guaranteed a place in the knockout phase while the Medellin-based outfit can now focus on domestic honors, having taken just three points from five matches in the continental tournament.

In Thursday's other Group A match, Argentina's Estudiantes de la Plata beat group leaders Barcelona de Guayaquil of Ecuador 3-0, with Facundo Sanchez scoring a brace.

And Argentine giants River Plate secured top spot in Group C with a game in hand by clinching a 3-2 victory away to Peru's Melgar.

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