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Uruguayan football coach (1900–1971)
For the pole vaulter of this name, see Ricardo Diez (athlete).
Diez, who smoked filterless cigarettes of the Continental brand, is best known for his times with Atlético Mineiro, which he coached on various stints between 1950 and 1960, winning the Campeonato Mineiro in 1949 and 1954. In 1950 he guided Atlético on its successful trip to Central Europe during the northern winter, which became part of the club's folklore and led to its nickname Campeões do Gelo, the "Ice Champions". In total he guided the club in 168 matches, a statistic only outdone by three other coaches, amongst them Telê Santana.
Back to Pernambuco, he became third in the State Championship of 1957 with Náutico, and in 1960 he led Santa Cruz FC to the second place behind Náutico.