Robert Sidney Buck (27 November 1884 – 15 May 1960) was a footballer who played international football for both Argentina and Uruguay.
Club career Buck played for Montevideo Wanderers F.C. and Quilmes Atlético Club.
International career Buck made his debut for Uruguay against Argentina in a Copa Newton match in Montevideo. He later represented Uruguay at the unofficial 1910 Copa América where he scored one goal for the tournament.
In 1912 Buck played one match for Argentina against Uruguay in Montevideo.
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